{"title":"PV Heating Elements \u0026 Hot Water Storage Tanks with Direct Connection","description":"\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003ePV heating elements and hot water storage tanks with direct PV connection enable the use of solar power for electric water heating. Depending on the system, suitable photovoltaic modules are connected directly to the heating element or to the hot water storage tank designed for this purpose.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDiscover heating elements, solar boilers, and hot water storage tanks for off-grid or supplementary PV applications. When selecting, pay particular attention to the required PV output, electrical voltage, connection type, and storage volume. The respective product specifications show which components are compatible with each other.\u003c\/span\u003e\u003c\/p\u003e","products":[{"product_id":"pv-heizstab-nachruestset-nexol-nex-r1-1-5-kw-energy-controller","title":"PV heating element retrofit kit Nexol NEX R1 1.5 kW with energy controller","description":"\u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eNexol NEX R1 – generate hot water directly with photovoltaic power\u003c\/h2\u003e \u003cp\u003eThe \u003cstrong\u003eNexol NEX R1\u003c\/strong\u003e is a plug-and-play retrofit system for the direct use of photovoltaic power for hot water preparation. The system consists of a screw-in heating element and an intelligent energy controller with touch display. It is suitable for compatible hot water and buffer tanks with a free \u003cstrong\u003e1 1\/2-inch screw-in socket\u003c\/strong\u003e.\u003c\/p\u003e \u003cp\u003eThe direct current generated by the connected PV modules is used directly to heat the tank water. A separate inverter is not required for this operating mode. If the PV output is insufficient, the NEX R1 can additionally heat via the 230-volt mains connection.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eStepless power control with MPP tracking\u003c\/h2\u003e \u003cp\u003eThe energy controller continuously adjusts the heating output to the currently available solar power. The integrated MPP tracking determines the optimal operating point of the connected PV module string, thereby supporting the best possible use of the available solar energy.\u003c\/p\u003e \u003cp\u003eThe maximum heating output is \u003cstrong\u003e1.5 kW\u003c\/strong\u003e. For the PV input, a rated voltage of at least 100 V is intended. The maximum PV open-circuit voltage is 300 V, and the maximum permissible PV short-circuit current is 15 A. Systems with a PV output of up to approximately 2,500 Wp are recommended as suitable.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eOperation and demand-based grid backup heating\u003c\/h2\u003e \u003cp\u003eOperation is carried out via the controller\u0026#39;s integrated touch display. Operating parameters and target temperatures can be adapted to the respective storage system and the desired hot water demand.\u003c\/p\u003e \u003cp\u003ePV energy is used primarily for water heating. If the current solar output is insufficient, the optional grid backup heating can supplement hot water preparation via the connection with 230 V and 50–60 Hz. This makes it possible to combine solar self-consumption with demand-based hot water supply.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eFor storage tanks up to 300 liters\u003c\/h2\u003e \u003cp\u003eThe NEX R1 is intended for suitable hot water and buffer storage tanks with a volume of up to 300 liters. The screw-in heating element has a connection thread of 1 1\/2 inches and a heating rod length of 350 mm. The overall dimensions of the heating element are 89 × 89 × 500 mm.\u003c\/p\u003e \u003cp\u003eBefore installation, the connection thread, installation length, and the available interior space of the storage tank must be checked. When installed, the heating element must not collide with heat exchangers, thermowells, anodes, or the storage tank wall.\u003c\/p\u003e \u003c\/div\u003e \u003cstyle\u003e .product-th{margin-top:2rem} .product-th h2{margin:0 0 1rem} .product-th__table{width:100%;border-collapse:separate;border-spacing:0} .product-th__table td{padding:.95rem 1rem;vertical-align:top} .product-th__label{font-weight:700;width:38%;color:#213670} .product-th__value{color:#1f2937} .product-th__table tr:nth-child(odd) td{background:#f4f7fb} .product-th__table tr:nth-child(even) td{background:#fafbfd} \u003c\/style\u003e \u003cdiv class=\"product-th\"\u003e \u003ch2\u003eTechnical data\u003c\/h2\u003e \u003ctable class=\"product-th__table\"\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eModel\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eNexol NEX R1\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eHeating output\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e1.5 kW\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eHeating rod length\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e350 mm\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eHeater dimensions\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e89 × 89 × 500 mm\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eConnection thread\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e1 1\/2 inch\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eMaximum tank volume\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e300 liters\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eRecommended PV output\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eup to 2,500 Wp\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003ePV nominal voltage\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003efrom 100 V\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eMaximum PV open-circuit voltage\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e300 V\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eMaximum PV short-circuit current\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e15 A\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eMains connection\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e230 V \/ 50–60 Hz\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eProtection rating of heating element\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eIP65\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eProtection rating of controller\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eIP21\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eMaximum operating temperature\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e80 °C\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eMaximum operating pressure\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e10 bar\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eMPP tracking\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eYes\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eOperation\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eTouch display\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eOrigin\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eMade in Germany\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eInstallation\u003c\/h2\u003e \u003cp\u003eMechanical installation on the storage tank as well as connection to mains voltage, PV DC voltage, and protective conductor must be carried out by appropriately qualified specialist personnel. The storage tank must be completely filled and vented before electrical connection.\u003c\/p\u003e \u003cp\u003eThe screw-in heating element may only be operated when the heating elements are completely surrounded by water. Dry operation can damage the heating element and poses a safety risk.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eImportant planning notes\u003c\/h2\u003e \u003cp\u003eBefore installation, the technical limit values of the PV module string must be compared with the input data of the controller. The maximum PV open-circuit voltage of 300 V and the maximum short-circuit current of 15 A must not be exceeded even under unfavorable temperature and irradiance conditions.\u003c\/p\u003e \u003cp\u003eThe suitability of the storage tank must be checked based on connection size, installation length, operating pressure, operating temperature, and available interior space. The NEX R1 supplements an existing hot water system and does not replace professional system planning.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eScope of delivery\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eNexol NEX R1 energy controller with touch display\u003c\/li\u003e \u003cli\u003eAC\/DC screw-in heating element with 1 1\/2-inch connection thread\u003c\/li\u003e \u003cli\u003eMains connection cable with protective contact plug\u003c\/li\u003e \u003cli\u003ePrepared connection cables for system operation\u003c\/li\u003e \u003c\/ul\u003e \u003c\/div\u003e","brand":"NEXOL","offers":[{"title":"Numatytasis pavadinimas","offer_id":58262206021980,"sku":"NEXR1","price":690.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/7796\/6428\/files\/gema-shop-nexol-nex-r1-pv-heizstab_a82d8416-6f3e-4883-af72-1da9134f6222.jpg?v=1783926303"},{"product_id":"nexol-nex-r2-pv-heizstab-nachruestset-1-5-kw-zweizonenheizung","title":"Nexol NEX R2 PV heating rod retrofit kit 1.5 kW with two-zone heating","description":"\u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eProduct Overview \u0026amp; Area of Application\u003c\/h2\u003e \u003cp\u003eThe Nexol NEX R2 is a PV heating rod retrofit kit for suitable hot water and drinking water storage tanks with two free threaded sockets. The system uses the direct current from connected photovoltaic modules directly for electric hot water preparation. An additional inverter is not required for PV heating operation.\u003c\/p\u003e \u003cp\u003eThe NEX R2 is particularly suitable for larger hot water storage tanks and for systems where rapid hot water availability is to be combined with the most comprehensive possible use of the available photovoltaic power.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eTwo-zone heating for targeted tank loading\u003c\/h2\u003e \u003cp\u003eThe system operates with two electrically insulated heating elements. The upper heating element preferentially heats the upper tank area so that usable hot water is available more quickly. The available PV power can then be used to further heat the lower tank area.\u003c\/p\u003e \u003cp\u003eThanks to this two-zone control, the tank is not exclusively heated evenly from below. Instead, the NEX R2 first prioritizes the upper zone relevant for hot water draw-off and then uses additional solar energy for further tank loading.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eEnergy Controller with integrated MPP tracking\u003c\/h2\u003e \u003cp\u003eThe Nexol Energy Controller handles the control, temperature monitoring, and power distribution between the two heating elements. Operation is via a 2.8-inch color touch display.\u003c\/p\u003e \u003cp\u003eThe integrated MPP tracking adapts the power consumption to the currently available power of the connected photovoltaic modules. The maximum usable PV power is 1.5 kW. For a suitable system design, an installed PV power of approx. 2.5 kW is recommended.\u003c\/p\u003e \u003cp\u003eThe photovoltaic modules are connected via MC4 connectors. The permissible PV input range includes a minimum rated voltage of 100 V, a maximum open-circuit voltage of 300 V, and a maximum short-circuit current of 15 A.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eOptional backup heating via the power grid\u003c\/h2\u003e \u003cp\u003eWhen photovoltaic power is low or unavailable, hot water preparation can optionally be supported by electric grid backup heating. The grid connection operates at 230 V with a power of 1.5 kW.\u003c\/p\u003e \u003cp\u003eThe grid backup heating can be used or deactivated depending on the system configuration and the selected settings. For the grid connection, a fuse rating of 10 to 16 A is required.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eFor retrofitting suitable hot water storage tanks\u003c\/h2\u003e \u003cp\u003eFor installation, two suitable threaded openings with 1 1\/2 inch threads each are required. The insertion depth of the heating elements is 350 mm. In addition, the required installation space inside the tank must be taken into account.\u003c\/p\u003e \u003cp\u003eThe two heating elements have an unheated area of 100 mm. The housing of the heating elements is designed with IP65 protection rating. The Energy Controller has IP21 protection rating and is intended for installation in a dry indoor area.\u003c\/p\u003e \u003c\/div\u003e \u003cstyle\u003e .product-th{margin-top:2rem} .product-th h2{margin:0 0 1rem} .product-th__table{width:100%;border-collapse:separate;border-spacing:0} .product-th__table td{padding:.95rem 1rem;vertical-align:top} .product-th__label{font-weight:700;width:38%;color:#213670} .product-th__value{color:#1f2937} .product-th__table tr:nth-child(odd) td{background:#f4f7fb} .product-th__table tr:nth-child(even) td{background:#fafbfd} .product-th__group td{background:#213670!important;color:#fff!important;font-weight:700;padding:.8rem 1rem} \u003c\/style\u003e \u003cdiv class=\"product-th\"\u003e \u003ch2\u003eTechnical Data\u003c\/h2\u003e \u003ctable class=\"product-th__table\"\u003e \u003ctbody\u003e \u003ctr class=\"product-th__group\"\u003e \u003ctd colspan=\"2\"\u003eEnergy Controller\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eDisplay\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e2.8-inch color touchscreen\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eAmbient temperature range\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e5 to 40 °C\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003ePermissible humidity\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e10 to 95 %, non-condensing\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003ePermissible degree of pollution\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e1\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eProtection class\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eIP21\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eWeight\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e2.4 kg\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eDimensions\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e339 × 177 × 104 mm\u003c\/td\u003e \u003c\/tr\u003e \u003ctr class=\"product-th__group\"\u003e \u003ctd colspan=\"2\"\u003eHeating elements\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eNumber of heating elements\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e2\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eMaximum heating output\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e1.5 kW\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eScrew-in depth\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e350 mm\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eProtection class\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eIP65\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eScrew-in thread\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e1 1\/2 inch\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eUnheated area\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e100 mm\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eMaximum tightening torque\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e60 Nm for brass thread\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eWrench size\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e60 mm\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eMaximum operating pressure\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e1 MPa \/ 10 bar\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eDimensions per heating element\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e89 × 89 × 500 mm\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eElectrical insulation\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eYes\u003c\/td\u003e \u003c\/tr\u003e \u003ctr class=\"product-th__group\"\u003e \u003ctd colspan=\"2\"\u003ePhotovoltaic specifications\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eRecommended installed PV output\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e2.5 kW\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eMaximum usable PV output\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e1.5 kW\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eMinimum PV rated voltage\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e100 V DC\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eMaximum PV open-circuit voltage\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e300 V DC\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eMaximum PV short-circuit current\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e15 A\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003ePV connections\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eMC4\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eMPP tracking\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eIntegrated\u003c\/td\u003e \u003c\/tr\u003e \u003ctr class=\"product-th__group\"\u003e \u003ctd colspan=\"2\"\u003eOptional mains connection\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eOutput\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e1.5 kW\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eInput voltage\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e230 V AC\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eInput frequency\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e50 to 60 Hz\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eRequired fuse protection\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e10 to 16 A\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eInstallation instructions\u003c\/h2\u003e \u003cp\u003eThe two heating elements must be screwed horizontally into the designated tank sockets. During operation, the heated areas of the elements must be completely surrounded by water.\u003c\/p\u003e \u003cp\u003eBefore installation, check the existing connection threads, the available installation space, the tank geometry, and the position of existing immersion sleeves or heat exchangers. The heating elements must not touch the tank wall or any other components.\u003c\/p\u003e \u003cp\u003eThe maximum tightening torque of 60 Nm must not be exceeded for a brass thread. A wrench size of 60 mm is required for installation.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eElectrical installation\u003c\/h2\u003e \u003cp\u003eThe Energy Controller may only be operated within the specified ambient conditions. Installation must be carried out in a dry and adequately ventilated indoor area.\u003c\/p\u003e \u003cp\u003eWork on the photovoltaic DC circuit, the optional 230 V mains connection, and the protective conductor may only be carried out by appropriately qualified specialist personnel. The maximum PV open-circuit voltage of 300 V and the maximum PV short-circuit current of 15 A must not be exceeded.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eScope of delivery\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eNexol Energy Controller\u003c\/li\u003e \u003cli\u003eTwo electrically insulated screw-in heating elements\u003c\/li\u003e \u003cli\u003eConnection cables for the system components\u003c\/li\u003e \u003c\/ul\u003e \u003c\/div\u003e","brand":"NEXOL","offers":[{"title":"Numatytasis pavadinimas","offer_id":58262251110748,"sku":"NEXR2","price":829.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/7796\/6428\/files\/gema-shop-nexol-nex-r2-pv-heizstab-set_c0cb0650-dc16-4dad-affd-5845bbfb85df.jpg?v=1783926311"},{"product_id":"solar-heizstab-fothermo-rod-550-550-w-mc4","title":"Solar heating element fothermo ROD-550 – 550 W PV heating element with MC4","description":"\u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eProduct Overview \u0026amp; Application Area\u003c\/h2\u003e \u003cp\u003eThe fothermo ROD-550 is a photovoltaic screw-in heating element for direct water heating in suitable hot water and heating storage tanks. The direct current from the photovoltaic modules is used directly for heat generation. For pure off-grid operation, neither an inverter nor a battery storage system is required.\u003c\/p\u003e \u003cp\u003eThe solar heating element achieves a heating output of up to 550 W in photovoltaic operation. It is suitable for storage tanks with a matching G-1-1\/2-inch thread socket and sufficient installation space. The actually available heating output depends on the connected module output and the current solar irradiation.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eTechnology \u0026amp; Equipment\u003c\/h2\u003e \u003cp\u003eAn integrated MPP tracker adapts operation to the available output of the photovoltaic modules. The digital display shows the current water temperature, PV input power, input voltage, and the total photovoltaic energy used.\u003c\/p\u003e \u003cp\u003eThe desired maximum temperature is adjustable and preset to 65 °C at the factory. The heating process ends as soon as the set temperature is reached. An integrated reverse polarity protection supports the safe connection of the photovoltaic modules.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eEveryday Benefits\u003c\/h2\u003e \u003cp\u003eThe ROD-550 uses solar power directly where heat is needed: in the existing water storage tank. This can relieve the conventional hot water preparation, especially during sun-rich periods.\u003c\/p\u003e \u003cp\u003eThe direct MC4 connection reduces the required system setup. The heating element operates with safety extra-low voltage and independently of the public power grid. The display enables quick monitoring of the current operating status.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eSystem Integration \u0026amp; Compatibility\u003c\/h2\u003e \u003cp\u003eThe heating element is screwed into a designated tank socket via a G-1-1\/2-inch external thread. Before selection, the connection size, available installation space, and the suitability of the tank for a screw-in heating element must be checked.\u003c\/p\u003e \u003cp\u003eThe photovoltaic modules are connected via the permanently mounted MC4 connectors. Multiple modules may only be connected in parallel. The maximum open-circuit voltage of the connected modules must not exceed 50 V DC. A total of up to 2,000 Wp of photovoltaic power can be connected.\u003c\/p\u003e \u003c\/div\u003e \u003cstyle\u003e .product-th{margin-top:2rem}.product-th h2{margin:0 0 1rem}.product-th__table{width:100%;border-collapse:separate;border-spacing:0}.product-th__table td{padding:.95rem 1rem;vertical-align:top}.product-th__label{font-weight:700;width:38%;color:#213670}.product-th__value{color:#1f2937}.product-th__table tr:nth-child(odd) td{background:#f4f7fb}.product-th__table tr:nth-child(even) td{background:#fafbfd} \u003c\/style\u003e \u003cdiv class=\"product-th\"\u003e \u003ch2\u003eTechnical data at a glance\u003c\/h2\u003e \u003ctable class=\"product-th__table\"\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eHeating output\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eup to 550 W in PV operation\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003ePV voltage\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003emaximum 50 V DC open-circuit voltage\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eElectrical connection\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eMC4\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eInstallation length\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eapprox. 303 mm\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eMaximum water temperature\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e85 °C\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eStorage tank connection\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eG 1 1\/2 inch external thread\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eWeight\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eapprox. 0.8 kg\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eInstallation\u003c\/h2\u003e \u003cp\u003eInstallation must be carried out by a qualified person in compliance with local regulations and the complete manufacturer\u0026#39;s instructions. Before screwing in, drain the storage tank and seal the connection thread properly.\u003c\/p\u003e \u003cp\u003eAfter installation, the storage tank must be completely filled with water before connecting the photovoltaic modules. Align the housing so that the MC4 connectors point downward and are protected from water contact.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eNotes\u003c\/h2\u003e \u003cp\u003eDry operation of the heating element is not permitted. Photovoltaic modules may only be connected in parallel; connecting them in series can damage the device. The maximum open-circuit voltage of 50 V DC must not be exceeded.\u003c\/p\u003e \u003cp\u003eFor service and drinking water as well as for water with a high lime content, the temperature must be limited to a maximum of 65 °C. The possible amount of hot water and heating time depend on the storage tank volume, initial temperature, PV output, and solar irradiation.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eScope of delivery\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e1 x fothermo solar heating element ROD-550\u003c\/li\u003e \u003cli\u003e1 x manufacturer\u0026#39;s operating instructions\u003c\/li\u003e \u003c\/ul\u003e \u003c\/div\u003e","brand":"Fothermo","offers":[{"title":"Numatytasis pavadinimas","offer_id":58442486579548,"sku":"FSHP500","price":399.99,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/7796\/6428\/files\/fothermo_photovoltaischer_Heizstab_Ansicht_01_608x608_0b6b57f0-fb88-4a26-8827-d92bd906c911.webp?v=1785219619"},{"product_id":"fothermo-rod-1000-solar-heizstab-1-kw","title":"Solar heating element fothermo ROD-1000 – 1,000 W with surplus output","description":"\u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eProduct Overview \u0026amp; Area of Application\u003c\/h2\u003e \u003cp\u003eThe fothermo ROD-1000 is a photovoltaic screw-in heating element for the direct use of solar power for hot water preparation. Its heating output is continuously regulated between 0 and 1,000 W depending on the available photovoltaic energy.\u003c\/p\u003e \u003cp\u003eThe solar heating element is suitable for retrofitting suitable hot water tanks with a horizontally arranged G-1-1\/2-inch thread socket. It is particularly intended for tanks up to approximately 500 liters and can support hot water preparation by gas, oil, or pellet heating systems as well as heat pumps.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eTechnology \u0026amp; Equipment\u003c\/h2\u003e \u003cp\u003eThe photovoltaic modules are connected directly to the heating element via MC4-compatible solar connectors. No connection to the 230 V mains is required for heating operation. An integrated MPP tracker adapts the operating point to the available PV output and continuously controls the heating output.\u003c\/p\u003e \u003cp\u003eThe display shows the current water temperature, the voltage and input power of the photovoltaic modules, the power delivered at the surplus output, as well as the energy quantities recorded for hot water preparation and surplus utilization.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eEveryday Benefits\u003c\/h2\u003e \u003cp\u003eThe ROD-1000 uses the direct current of the photovoltaic modules directly for heating the tank water without prior conversion. This allows existing solar energy to be used specifically for hot water preparation and reduces the operating time of the existing heat generator.\u003c\/p\u003e \u003cp\u003eThe recommended connected photovoltaic output of 1,500 to 2,500 W supports a high usable heating output even with varying solar radiation. A total of up to 3,000 W of photovoltaic output may be connected.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eSystem Integration \u0026amp; Compatibility\u003c\/h2\u003e \u003cp\u003eThe connected photovoltaic modules must be wired in parallel. Their maximum open-circuit voltage must not exceed 50 V DC. For the highest possible heating output, modules with an MPP voltage of 38 to 43 V are recommended.\u003c\/p\u003e \u003cp\u003eOnce the set water temperature has been reached, the photovoltaic energy can be routed via the integrated surplus output to a second fothermo solar heating element or a micro-PV inverter approved by fothermo. Batteries and battery storage systems are not approved for this output.\u003c\/p\u003e \u003c\/div\u003e \u003cstyle\u003e .product-th{margin-top:2rem}.product-th h2{margin:0 0 1rem}.product-th__table{width:100%;border-collapse:separate;border-spacing:0}.product-th__table td{padding:.95rem 1rem;vertical-align:top}.product-th__label{font-weight:700;width:38%;color:#213670}.product-th__value{color:#1f2937}.product-th__table tr:nth-child(odd) td{background:#f4f7fb}.product-th__table tr:nth-child(even) td{background:#fafbfd} \u003c\/style\u003e \u003cdiv class=\"product-th\"\u003e \u003ch2\u003eTechnical data at a glance\u003c\/h2\u003e \u003ctable class=\"product-th__table\"\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eHeating output\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e0 to 1,000 W, continuously variable\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eMaximum PV voltage\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e50 V DC open-circuit voltage\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eElectrical connection\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eMC4-compatible solar connectors\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eHeating element length\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e315 mm\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eUnheated heating element length\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e50 mm\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eMaximum water temperature\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e85 °C in scale-free water\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eStorage tank connection\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eG 1 1\/2 inch\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eWeight\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e0.9 kg\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eMounting\u003c\/h2\u003e \u003cp\u003eThe heating element is screwed horizontally into a suitable G-1-1\/2-inch socket of the tank and sealed professionally. Installation, electrical connection, and functional testing must be carried out by qualified personnel in compliance with local regulations.\u003c\/p\u003e \u003cp\u003eBefore connecting the photovoltaic modules, the tank must be completely filled with water and properly grounded. The PV modules are connected in parallel and connected to the marked input with correct polarity.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eNotes\u003c\/h2\u003e \u003cp\u003eDry operation is not permitted. The installation location must be dry and frost-free. If the service or drinking water contains lime, the set water temperature must be limited to a maximum of 65 °C.\u003c\/p\u003e \u003cp\u003eNo energy source may be connected to the surplus output. Reverse current into the solar heating element must be prevented. Only suitable devices that are currently approved by the manufacturer may be connected.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eScope of delivery\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e1 x fothermo solar heating element ROD-1000\u003c\/li\u003e \u003cli\u003e1 x safety and quick-start guide\u003c\/li\u003e \u003cli\u003e1 x quick-start installation guide\u003c\/li\u003e \u003cli\u003e1 x guide to crimping DC solar cables and warning note on connecting the PV modules\u003c\/li\u003e \u003cli\u003e2 x pair of solar plug connectors\u003c\/li\u003e \u003c\/ul\u003e \u003c\/div\u003e","brand":"Fothermo","offers":[{"title":"Numatytasis pavadinimas","offer_id":58447512961372,"sku":"FSHP1000","price":549.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/7796\/6428\/files\/fothermo_photovoltaischer_Heizstab_Ansicht_01_608x608_0b6b57f0-fb88-4a26-8827-d92bd906c911.webp?v=1785219619"},{"product_id":"solar-offgridboiler-fothermo-pvb-30-30-liter-550-w","title":"Solar off-grid boiler fothermo PVB-30 – 30 liters, 550 W","description":"\u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eProduct Overview \u0026amp; Areas of Application\u003c\/h2\u003e \u003cp\u003eThe fothermo PVB-30 is a wall-mounted solar off-grid boiler for direct hot water preparation using direct current from photovoltaic modules. In pure PV operation, the storage tank does not require a connection to the public 230 V power grid, making it suitable for garden houses, holiday homes, and other off-grid applications.\u003c\/p\u003e \u003cp\u003eThe device belongs to the 30-liter class and has an actual usable capacity of 29 liters. In addition to providing an independent hot water supply, the off-grid boiler can be used for preheating drinking water before a tankless water heater or an existing heating system.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eTechnology \u0026amp; Equipment\u003c\/h2\u003e \u003cp\u003eThe integrated heating element uses up to 550 W depending on the available solar power. An MPP tracker adapts operation to the operating point of the connected photovoltaic modules. The current water temperature, PV power, PV voltage, and the total photovoltaic energy used can be viewed on the digital display.\u003c\/p\u003e \u003cp\u003eThe pressure-resistant steel tank is enameled on the inside and additionally protected against corrosion by a magnesium anode. Thermal insulation made of CFC-free polyurethane foam reduces heat losses. The PVB-30 achieves energy efficiency class A+.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eEveryday Benefits\u003c\/h2\u003e \u003cp\u003eBy directly using photovoltaic power, water is heated without an upstream inverter. A connected PV power of 300 to 600 Wp is recommended for the PVB-30. A larger generator output can help maintain the available heating power for longer, especially in weaker sunlight.\u003c\/p\u003e \u003cp\u003eAt maximum heating power, the water temperature in the 30-liter model rises by approximately 16 °C per hour. The actual temperature increase depends, among other things, on the initial temperature, water draw-off, ambient temperature, and current solar radiation.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eSystem Integration \u0026amp; Compatibility\u003c\/h2\u003e \u003cp\u003eThe photovoltaic modules are connected via MC4 connectors and may only be wired in parallel. The maximum open-circuit voltage is 42.4 V DC. Depending on the module type used, up to five modules with a total maximum of 1,500 Wp can be connected.\u003c\/p\u003e \u003cp\u003eUsing separately available fothermo components, the off-grid boiler can also be operated with a power supply unit, a suitable 12 V or 24 V battery system, or an external energy management system. The required connection cables and power supply devices are not included in the standard scope of delivery.\u003c\/p\u003e \u003c\/div\u003e \u003cstyle\u003e .product-th{margin-top:2rem}.product-th h2{margin:0 0 1rem}.product-th__table{width:100%;border-collapse:separate;border-spacing:0}.product-th__table td{padding:.95rem 1rem;vertical-align:top}.product-th__label{font-weight:700;width:38%;color:#213670}.product-th__value{color:#1f2937}.product-th__table tr:nth-child(odd) td{background:#f4f7fb}.product-th__table tr:nth-child(even) td{background:#fafbfd} \u003c\/style\u003e \u003cdiv class=\"product-th\"\u003e \u003ch2\u003eTechnical data at a glance\u003c\/h2\u003e \u003ctable class=\"product-th__table\"\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eStorage type\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003ePhotovoltaic electric wall-mounted storage tank\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eUsable capacity\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e29 liters\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eSuitable for drinking water\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eYes\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eStorage tank\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eSteel with enamel coating\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eHeat exchanger\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eNone\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eInsulation\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eCFC-free polyurethane foam\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eMaximum water temperature\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e65 °C\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eNominal pressure\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e7 bar\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eDimensions\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eHeight 600 mm, width 400 mm, depth 400 mm\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eWeight\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e15 kg\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eMounting\u003c\/h2\u003e \u003cp\u003eThe PVB-30 is intended exclusively for vertical, fixed wall mounting in a dry and frost-free room. The mounting must be designed to support at least three times the weight of the appliance when filled with water. Sufficient space must be provided below the tank for the water and photovoltaic connections.\u003c\/p\u003e \u003cp\u003eThe combined check and pressure relief valve is mounted on the cold water connection. The supply pressure should be between 1 and 5 bar. If the line pressure is higher, an additional suitable pressure reducing valve is required. Before connecting an electrical energy source, the tank must be completely filled with water.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eNotes\u003c\/h2\u003e \u003cp\u003ePhotovoltaic modules may only be connected in parallel. A series connection can damage the tank. The maximum open-circuit voltage and the permissible connection power must be observed when selecting the modules.\u003c\/p\u003e \u003cp\u003eDuring water heating, expansion water may escape from the pressure relief valve. The valve opening must not be sealed. The magnesium anode must be checked regularly and replaced by a qualified professional if necessary. In regions with hard water, regular inspection and descaling are required.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eScope of delivery\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e1 x fothermo solar off-grid boiler PVB-30\u003c\/li\u003e \u003cli\u003e1 x combined check and pressure relief valve\u003c\/li\u003e \u003cli\u003e1 x manufacturer\u0026#39;s operating instructions\u003c\/li\u003e \u003c\/ul\u003e \u003c\/div\u003e","brand":"Fothermo","offers":[{"title":"Numatytasis pavadinimas","offer_id":58449460101468,"sku":"FOGB30","price":499.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/7796\/6428\/files\/fothermo_PVB80_front.webp?v=1785225793"},{"product_id":"solar-offgridboiler-fothermo-pvb-80-80-liter-550-w","title":"Solar off-grid boiler fothermo PVB-80 – 80 liters, 550 W","description":"\u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eProduct Overview \u0026amp; Areas of Application\u003c\/h2\u003e \u003cp\u003eThe fothermo PVB-80 is a wall-mounted solar off-grid boiler for direct hot water preparation using direct current from photovoltaic modules. In pure photovoltaic operation, the storage tank requires neither an inverter nor a connection to the public 230 V power grid.\u003c\/p\u003e \u003cp\u003eThe device belongs to the 80-liter class and has an actual usable capacity of 77 liters. It is suitable for independent hot water supply at off-grid locations as well as for preheating drinking water before an electric instantaneous water heater or an existing heating system.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eTechnology \u0026amp; Equipment\u003c\/h2\u003e \u003cp\u003eThe integrated heating element uses a heating output of up to 550 W, depending on the available solar energy. An MPP tracker adapts the electrical operating point to the connected photovoltaic modules and the current solar radiation.\u003c\/p\u003e \u003cp\u003eThe digital display shows the current water temperature, the input power and input voltage of the photovoltaic modules, as well as the total photovoltaic energy used. An integrated reverse polarity protection supports safe PV connection.\u003c\/p\u003e \u003cp\u003eThe pressure-resistant storage tank is made of steel with an enamel coating and is additionally protected against corrosion by a magnesium anode. A 33 mm thick insulation made of polyurethane foam reduces heat losses from the storage tank.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eEveryday Benefits\u003c\/h2\u003e \u003cp\u003eFor the PVB-80, a photovoltaic output of 600 to 1,200 Wp is recommended. A higher connected module output supports hot water preparation, especially in weaker sunlight. According to the current product data sheet, up to 2,000 Wp can be connected, while the electrical heating output of the boiler remains limited to a maximum of 550 W.\u003c\/p\u003e \u003cp\u003eWith a heating output of 550 W, the water temperature increases by approximately 6 °C per hour. When the storage tank is fully heated to 65 °C, depending on the cold water temperature, about 180 liters of mixed water at 34 °C can be provided.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eSystem Integration \u0026amp; Compatibility\u003c\/h2\u003e \u003cp\u003eThe photovoltaic modules are connected directly to the off-grid boiler via MC4 connectors. Multiple modules may only be connected in parallel. The maximum open-circuit voltage of the connected modules must be limited to 42.4 V DC.\u003c\/p\u003e \u003cp\u003eFor optional auxiliary heating, an approved fothermo power supply unit can be connected. Depending on the power supply unit used, auxiliary heating outputs of 60, 160, or 240 W are available. The power supply unit, photovoltaic modules, parallel connectors, and extension cables are not included in the standard scope of delivery.\u003c\/p\u003e \u003c\/div\u003e \u003cstyle\u003e .product-th{margin-top:2rem}.product-th h2{margin:0 0 1rem}.product-th__table{width:100%;border-collapse:separate;border-spacing:0}.product-th__table td{padding:.95rem 1rem;vertical-align:top}.product-th__label{font-weight:700;width:38%;color:#213670}.product-th__value{color:#1f2937}.product-th__table tr:nth-child(odd) td{background:#f4f7fb}.product-th__table tr:nth-child(even) td{background:#fafbfd} \u003c\/style\u003e \u003cdiv class=\"product-th\"\u003e \u003ch2\u003eTechnical Data at a Glance\u003c\/h2\u003e \u003ctable class=\"product-th__table\"\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eStorage Type\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003ePhotovoltaic Electric Wall-Mounted Storage Tank\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eUsable Capacity\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e77 liters\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eSuitable for Drinking Water\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eYes\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eStorage tank\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eSteel with enamel coating\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eHeat exchanger\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eNone\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eInsulation\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e33 mm rigid polyurethane foam\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eMaximum water temperature\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e65 °C\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eMaximum operating pressure\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e7 bar\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eDimensions\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eHeight 900 mm, width 480 mm, depth 470 mm\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eWeight\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e25 kg\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eMounting\u003c\/h2\u003e \u003cp\u003eThe PVB-80 is intended exclusively for vertical, fixed wall mounting in a dry and frost-free room. The mounting elements and the load-bearing wall must be designed for at least three times the weight of the storage tank when filled with water.\u003c\/p\u003e \u003cp\u003eThe combined check and pressure relief valve must be installed at the cold water connection. The water pressure should be between 1 and 5 bar. If the supply pressure is higher, a suitable pressure reducing valve is required.\u003c\/p\u003e \u003cp\u003eBefore connecting the photovoltaic modules or another approved energy supply, the storage tank must be completely filled with water and the hydraulic installation must be checked for leaks.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eNotes\u003c\/h2\u003e \u003cp\u003ePhotovoltaic modules may only be connected in parallel. A series connection can exceed the permissible input voltage and damage the off-grid boiler.\u003c\/p\u003e \u003cp\u003eDuring water heating, expansion water may escape from the pressure relief valve. The side valve opening must remain permanently open and the escaping water must be safely drained via a suitable drain option.\u003c\/p\u003e \u003cp\u003eThe magnesium anode is a wear part and must be checked regularly by a qualified technician. In regions with hard water, regular inspection and cleaning of the storage tank is also required.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eScope of delivery\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e1 x fothermo solar off-grid boiler PVB-80\u003c\/li\u003e \u003cli\u003e1 x combined check and pressure relief valve\u003c\/li\u003e \u003cli\u003e1 x manufacturer\u0026#39;s operating instructions\u003c\/li\u003e \u003c\/ul\u003e \u003c\/div\u003e","brand":"Fothermo","offers":[{"title":"Numatytasis pavadinimas","offer_id":58449862361436,"sku":"FOGB80","price":599.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/7796\/6428\/files\/fothermo_PVB80_front.webp?v=1785225793"},{"product_id":"solar-hybridboiler-fothermo-pvb-30-ac-30-liter","title":"Solar hybrid boiler fothermo PVB-30-AC – 30 liters, 550 W PV \/ 1,500 W AC","description":"\u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eProduct Overview \u0026amp; Areas of Application\u003c\/h2\u003e \u003cp\u003eThe fothermo PVB-30-AC is a wall-mounted solar hybrid boiler for water heating using photovoltaic power and on-demand auxiliary heating via the 230 V mains supply. The direct current from the connected photovoltaic modules is used directly to heat the stored water without an upstream inverter.\u003c\/p\u003e \u003cp\u003eThe device belongs to the 30-liter class and has an actual usable capacity of 29 liters. Thanks to the integrated mains auxiliary heating, the hybrid boiler can replace a classic electric boiler in a compact hot water system and maintain an adjustable minimum temperature even when solar radiation is low.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eTechnology \u0026amp; Equipment\u003c\/h2\u003e \u003cp\u003eFor photovoltaic operation, a continuously adjustable heating output of up to 550 W is available. An integrated MPP tracker adjusts the operating point to the available solar power. The digital display shows the water temperature, PV input power, PV voltage, and the total photovoltaic energy used.\u003c\/p\u003e \u003cp\u003eA second heating element enables auxiliary heating with 1,500 W via the 230 V mains supply. The desired minimum temperature is set using a rotary thermostat. If the water temperature falls below this value, the water is automatically reheated with mains electricity.\u003c\/p\u003e \u003cp\u003eThe pressure-resistant storage tank is made of enamelled steel and is additionally protected against corrosion by a magnesium anode. Thermal insulation made of CFC-free polyurethane foam reduces standby heat losses.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eEveryday Benefits\u003c\/h2\u003e \u003cp\u003eWater heating is primarily carried out with directly available solar power. The mains auxiliary heating only takes over when the set minimum temperature is not reached. This reduces the share of mains electricity without having to completely do without weather-independent hot water supply.\u003c\/p\u003e \u003cp\u003eAt maximum PV heating output, the water temperature increases by approximately 16 °C per hour. The 1,500 W mains auxiliary heating achieves a temperature rise of about 43 °C per hour. A storage tank fully heated to 65 °C can provide approximately 72 to 75 liters of hot water at around 34 to 35 °C when mixed with cold water.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eSystem Integration \u0026amp; Compatibility\u003c\/h2\u003e \u003cp\u003eThe photovoltaic modules are connected directly to the hybrid boiler via MC4 connectors. Multiple modules must only be connected in parallel. For the 30-liter model, a photovoltaic output of 300 to 600 Wp is recommended; up to 2,000 Wp can be connected. The maximum open-circuit voltage must not exceed 42.4 V DC.\u003c\/p\u003e \u003cp\u003eThe hybrid boiler can also be operated exclusively with photovoltaic power. For automatic grid-based auxiliary heating, the existing 230 V connection is connected to a suitable socket. Photovoltaic modules, parallel connectors, extension cables, and mounting systems must be selected separately.\u003c\/p\u003e \u003c\/div\u003e \u003cstyle\u003e .product-th{margin-top:2rem}.product-th h2{margin:0 0 1rem}.product-th__table{width:100%;border-collapse:separate;border-spacing:0}.product-th__table td{padding:.95rem 1rem;vertical-align:top}.product-th__label{font-weight:700;width:38%;color:#213670}.product-th__value{color:#1f2937}.product-th__table tr:nth-child(odd) td{background:#f4f7fb}.product-th__table tr:nth-child(even) td{background:#fafbfd} \u003c\/style\u003e \u003cdiv class=\"product-th\"\u003e \u003ch2\u003eTechnical Data at a Glance\u003c\/h2\u003e \u003ctable class=\"product-th__table\"\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eStorage Type\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003ePressure-resistant solar electric wall-mounted storage tank\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eUsable Capacity\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e29 liters\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eSuitable for drinking water\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eYes\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eStorage tank\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eSteel with enamel coating\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eHeat exchanger\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eNone\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eInsulation\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eCFC-free rigid polyurethane foam\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eMaximum water temperature\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e65 °C\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eMaximum operating pressure\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e7 bar\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eDimensions\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eHeight 600 mm, width 400 mm, depth 400 mm\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eWeight\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e15 kg\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eMounting\u003c\/h2\u003e \u003cp\u003eThe PVB-30-AC is intended exclusively for vertical, fixed wall mounting in a dry and frost-free room. The wall and mounting elements must be designed for at least three times the weight of the device when filled with water.\u003c\/p\u003e \u003cp\u003eThe combined check and pressure relief valve must be installed at the cold water connection. The supply pressure should be between 1 and 5 bar. If the line pressure is higher, a suitable pressure reducing valve is required.\u003c\/p\u003e \u003cp\u003eBefore connecting the photovoltaic modules or the 230 V mains supply, the tank must be completely filled with water, vented, and checked for leaks.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eNotes\u003c\/h2\u003e \u003cp\u003ePhotovoltaic modules may only be connected in parallel. A series connection can exceed the permissible input voltage and damage the hybrid boiler.\u003c\/p\u003e \u003cp\u003eDuring water heating, expansion water may escape from the pressure relief valve. The side valve opening must remain permanently open and be drained via a suitable drain option.\u003c\/p\u003e \u003cp\u003eThe magnesium anode is a wear part and must be checked regularly. In addition, if the water is hard, the storage tank must be checked and descaled on a regular basis.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eScope of delivery\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e1 x fothermo solar hybrid boiler PVB-30-AC\u003c\/li\u003e \u003cli\u003e1 x combined check and pressure relief valve\u003c\/li\u003e \u003cli\u003e1 x manufacturer\u0026#39;s operating instructions\u003c\/li\u003e \u003c\/ul\u003e \u003c\/div\u003e","brand":"Fothermo","offers":[{"title":"Numatytasis pavadinimas","offer_id":58465079001436,"sku":"FHBB30","price":599.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/7796\/6428\/files\/fothermo_PVB_30_AC_freigestellt_300dpi.webp?v=1785302584"},{"product_id":"solar-hybridboiler-fothermo-pvb-80-ac-80-liter","title":"Solar hybrid water heater fothermo PVB-80-AC – 80 liters, 550 W PV \/ 1,500 W AC","description":"\u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eProduct Overview \u0026amp; Application\u003c\/h2\u003e \u003cp\u003eThe fothermo PVB-80-AC is a wall-mounted solar hybrid boiler for domestic hot water preparation with directly connected photovoltaic modules and demand-based reheating via the 230 V mains supply. The direct current from the PV modules is converted into heat directly in the storage tank without an upstream inverter.\u003c\/p\u003e \u003cp\u003eThe device belongs to the 80-liter class and has an actual usable capacity of 77 liters. Thanks to the integrated mains reheating, the hybrid boiler can replace a conventional electric boiler and maintain an adjustable minimum temperature even when solar radiation is low.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eTechnology \u0026amp; Equipment\u003c\/h2\u003e \u003cp\u003eFor photovoltaic operation, a heating output of up to 550 W is available. An integrated MPP tracker adjusts the electrical operating point to the available solar power. The current water temperature, PV input power, input voltage, and total photovoltaic energy used can be read on the digital display.\u003c\/p\u003e \u003cp\u003eA second heating element enables reheating with 1,500 W via the 230 V mains supply. The desired minimum temperature is set using a rotary thermostat. If the water temperature falls below this value, the water is automatically reheated using mains electricity.\u003c\/p\u003e \u003cp\u003eThe pressure-resistant storage tank is made of enamelled steel and is additionally protected against corrosion by a magnesium anode. The thermal insulation made of CFC-free polyurethane foam reduces standby heat losses. The PVB-80-AC has energy efficiency class C, load profile M, and a sound power level of 15 dB.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eEveryday Benefits\u003c\/h2\u003e \u003cp\u003eHot water preparation is primarily carried out using directly available photovoltaic energy. The mains reheating only takes over when the minimum temperature set on the thermostat is not reached. This allows the proportion of mains electricity to be reduced without having to do without weather-independent hot water supply.\u003c\/p\u003e \u003cp\u003eAt maximum PV heating output, the water temperature increases by approximately 6 °C per hour. The 1,500 W mains reheating achieves a temperature rise of about 16 °C per hour. If the storage tank is fully heated to 65 °C, approximately 180 liters of hot water at around 34 °C can be provided when mixed with cold water.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eSystem Integration \u0026amp; Compatibility\u003c\/h2\u003e \u003cp\u003eThe photovoltaic modules are connected directly to the hybrid boiler via MC4 connectors. Multiple modules may only be connected in parallel. For the 80-liter model, a photovoltaic output of 600 to 1,200 Wp is recommended. In total, up to 2,000 Wp can be connected, while the heating output of the boiler remains limited to a maximum of 550 W.\u003c\/p\u003e \u003cp\u003eThe maximum open-circuit voltage of the connected modules must not exceed 42.4 V DC. For automatic grid-assisted reheating, the existing 230 V connection is connected to a suitable socket. Photovoltaic modules, parallel connectors, extension cables, and mounting systems are not included in the standard scope of delivery.\u003c\/p\u003e \u003c\/div\u003e \u003cstyle\u003e .product-th{margin-top:2rem}.product-th h2{margin:0 0 1rem}.product-th__table{width:100%;border-collapse:separate;border-spacing:0}.product-th__table td{padding:.95rem 1rem;vertical-align:top}.product-th__label{font-weight:700;width:38%;color:#213670}.product-th__value{color:#1f2937}.product-th__table tr:nth-child(odd) td{background:#f4f7fb}.product-th__table tr:nth-child(even) td{background:#fafbfd} \u003c\/style\u003e \u003cdiv class=\"product-th\"\u003e \u003ch2\u003eTechnical Data at a Glance\u003c\/h2\u003e \u003ctable class=\"product-th__table\"\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eStorage Type\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003ePressure-resistant solar electric wall-mounted storage tank\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eUsable Capacity\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e77 liters\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eSuitable for drinking water\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eYes\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eStorage tank\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eSteel with enamel coating\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eHeat exchanger\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eNone\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eInsulation\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eCFC-free rigid polyurethane foam\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eMaximum water temperature\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e65 °C\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eMaximum operating pressure\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e7 bar\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eEnergy efficiency\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eClass C, load profile M\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eDimensions\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eHeight 900 mm, width 480 mm, depth 470 mm\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eWeight\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e25 kg\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eInstallation\u003c\/h2\u003e \u003cp\u003eThe PVB-80-AC is intended exclusively for vertical, fixed wall mounting in a dry and frost-free room. The wall and mounting elements must be designed for at least three times the weight of the appliance when filled with water.\u003c\/p\u003e \u003cp\u003eThe combined check and pressure relief valve must be installed at the cold water connection. The supply pressure should be between 1 and 5 bar. If the line pressure is higher, a suitable pressure reducing valve is required.\u003c\/p\u003e \u003cp\u003eBefore connecting the photovoltaic modules or the 230 V mains supply, the tank must be completely filled with water, vented, and checked for leaks.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eNotes\u003c\/h2\u003e \u003cp\u003ePhotovoltaic modules must only be connected in parallel. A series connection can exceed the permissible input voltage and damage the hybrid boiler.\u003c\/p\u003e \u003cp\u003eDuring water heating, expansion water may escape from the pressure relief valve. The side valve opening must remain permanently open and be drained via a suitable drain option.\u003c\/p\u003e \u003cp\u003eThe magnesium anode is a wear part and must be checked regularly. In addition, with hard water, regular inspection and descaling of the storage tank are required.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eScope of delivery\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e1 x fothermo solar hybrid boiler PVB-80-AC\u003c\/li\u003e \u003cli\u003e1 x combined check and pressure relief valve\u003c\/li\u003e \u003cli\u003e1 x manufacturer\u0026#39;s operating instructions\u003c\/li\u003e \u003c\/ul\u003e \u003c\/div\u003e","brand":"Fothermo","offers":[{"title":"Numatytasis pavadinimas","offer_id":58465090994524,"sku":"FHBB80","price":699.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/7796\/6428\/files\/fothermo_PVB_30_AC_freigestellt_300dpi.webp?v=1785302584"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/7796\/6428\/collections\/Direkt_PV_Anschluss.png?v=1785234695","url":"https:\/\/lt.gemashop.de\/en\/collections\/pv-heizstabe-warmwasserspeicher-mit-direktanschluss.oembed","provider":"GEMA Shop","version":"1.0","type":"link"}