Drinking water tank Hot water tank with heating element

GEMA hot water storage tank for domestic hot water with 1 heat exchanger (100–180 liters)

Efficient hot water heating

The GEMA hot water storage tank with integrated heat exchanger offers a centralized solution for the safe and efficient heating of domestic hot water. The internal heat exchanger unit utilizes the energy from a solar thermal system or the heat from a boiler, thus ensuring a consistently high level of hot water comfort.

By combining it with your photovoltaic system and an optional heating element, the energy yield can be further increased. This allows you to benefit from independent, environmentally friendly hot water preparation even on days with little sunshine.

Corrosion protection and durability

For long-term, trouble-free operation, the interior of the storage tank is lined with high-quality enamel. Additionally, a generously sized magnesium sacrificial anode protects the metal from corrosion and significantly extends its service life.

The rigid polyurethane foam (PUR) insulation minimizes heat loss and keeps your energy costs low. Even at maximum storage loads up to 95 °C, the material performs reliably and remains dimensionally stable.

Flexibility and connectivity options

The hot water storage tank has all standard connections: heating and return, domestic hot water supply and return, and circulation in ¾" male thread. An additional connection for a 1 ½" electric heating element can be retrofitted to integrate other heat sources.

This system is compatible with solid, wood, pellet and combination boilers, as well as solar thermal systems. This makes it versatile and allows it to be flexibly adapted to existing heating concepts.

Technical data and model variants

Storage capacities range from 100 to 180 liters and reliably cover the hot water needs of small to medium-sized households. The heat exchanger surface area varies between 1.2 and 1.67 m² depending on the model, and the exchanger volume between 5.3 and 7.8 liters.

Maximum operating pressures are 6 bar for the storage tank and heat exchanger, with a maximum temperature of 95 °C in the storage tank and 100 °C in the heat exchanger. Heat losses range from 28 to 42 watts, depending on the volume.

Dimensions and weights:

– 100 liters: Ø 625 × 770 mm, empty 64 kg
– 120 liters: Ø 565 × 1045 mm, empty 71 kg
– 150 liters: Ø 625 × 980 mm, empty 76 kg
– 180 liters: Ø 715 × 1030 mm, empty 88 kg

Retrofit electric heating element

For additional heating requirements, a 1.5 kW, 2.0 kW, or 3.0 kW heating element can be installed. All versions feature a temperature controller (23–75 °C), a safety limiter (85 °C), and operate with IP44 protection.

The electrically insulated design with a plastic housing and temperature-stabilized alloy (Alloy 825) guarantees high corrosion protection. The heating elements operate on a single phase (230 V/16 A) and provide flexible support as needed.

Technical specifications 100 liter storage

• Volume: 100 liters
• Heat exchanger surface area: 1.2 m²
• Heat exchanger capacity: 5.27 liters
• Heating flow and return connections: 3/4" AG
• Domestic hot water supply and return connections: 3/4" AG
• Circulation connection: 3/4" AG
• Magnesium anode connection: 1 1/4" IG
• Connection for electric heating: 1 1/2" IG
• Thermal insulation: Polyurethane foam (PUR)
• Maximum operating temperature of storage tank: 95 °C
• Maximum operating pressure of storage tank/heat exchanger: 6 bar
• Max.Operating temperature of heat exchanger: 100 °C
• Loss: 28 watts
• Dimensions with insulation (diameter x height): 625 x 770 mm
• Weight (empty): 64 kg

Technical specifications 120 liters

• Volume: 120 liters
• Heat exchanger surface area: 1.4 m²
• Heat exchanger capacity: 6.1 liters
• Heating flow and return connections: 3/4" AG
• Domestic hot water supply and return connections: 3/4" AG
• Circulation connection: 3/4" AG
• Magnesium anode connection: 1 1/4" IG
• Connection for electric heating: 1 1/2" IG
• Thermal insulation: Polyurethane foam (PUR)
• Maximum operating temperature of storage tank: 95 °C
• Maximum operating pressure of storage tank/heat exchanger: 6 bar
• Max. operating temperature heat exchanger 100 °C
• Loss: 32 watts
• Dimensions with insulation (diameter x height): 565 x 1045 mm
• Weight (empty): 71 kg

Technical specifications 150 liters

• volume: 150 liters
• Heat exchanger surface area: 1.4 m²
• Heat exchanger capacity: 6.1 liters
• Heating flow and return connections: 3/4" AG
• Domestic hot water supply and return connections: 3/4" AG
• Circulation connection: 3/4" AG
• Magnesium anode connection: 1 1/4" IG
• Connection for electric heating: 1 1/2" IG
• Thermal insulation: Polyurethane foam (PUR)
• Maximum operating temperature of storage tank: 95 °C
• Maximum operating pressure of storage tank/heat exchanger: 6 bar
• Max. operating temperature heat exchanger 100 °C
• Loss: 36 watts
• Inner diameter of storage tank: 510 mm
• Dimensions with insulation (diameter x height): 625 x 980 mm
• Weight (empty): 76 kg

Technical specifications 180 liters

• Volume: 183 liters
• Heat exchanger surface area: 1.67 m²
• Heat exchanger capacity: 7.8 liters
• Heating flow and return connections: 3/4" AG
• Domestic hot water supply and return connections: 3/4" AG
• Circulation connection: 3/4" AG
• Magnesium anode connection: 1 1/4" IG
• Connection for electric heating: 1 1/2" IG
• Thermal insulation: Polyurethane foam (PUR)
• Maximum operating temperature of storage tank: 95 °C
• Maximum operating pressure of storage tank/heat exchanger: 6 bar
• Max. operating temperature heat exchanger 100 °C
• Loss: 42 watts
• Internal diameter of storage tank: 715 mm
• Dimensions with insulation (diameter x height): 715 x 1030 mm
• Weight (empty): 88 kg

Technical data heating element 1.5 kW

• Heating output: 1.5 kW
• Temperature range: 5-75°C
• Switch-on hysteresis: 7-10°C
• Installation length: 300 mm
• Unheated length: 70 mm
• Safety temperature limiter: 93°C
• Connection: 1 1/2" male thread
• Maximum operating pressure: 10 bar
• Protection rating: IPX4
• Heating coil material: Alloy 825
• Housing material: plastic, white
• Power supply: 230V/16A, single-phase
• Connection cable: 1.5 meters with Schuko plug

Technical data heating element 2.0 kW

• Heating output: 2 kW
• Temperature control: 5-75°C
• Switch-on hysteresis: 7-10°C
• Installation length: 300 mm
• Unheated length: 70 mm
• Safety temperature limiter: 93°C
• Connection: 1 1/2" external thread
• Protection rating: IPX4
• Max.Operating pressure: 10 bar
• Outer shell material: Plastic, white
• Heating coil material: Alloy 825
• Power supply: single-phase 230 V/16 A
• Cable length: 1.5 meters with Schuko plug

Technical data Heating element 3.0 kW

• Heating output: 3 kW
• Temperature setting: 5°C to 75°C
• Switch-on hysteresis: 7-10°C
• Installation length: 420 mm
• Unheated length: 100 mm
• Safety temperature limiter: 93°C
• Connection: 1 1/2" AG
• Power supply: 400 V
• Protection rating: IPX4
• Maximum operating pressure: 10 bar
• Heating coil material: Alloy 825

Scope of delivery

– GEMA hot water storage tank with heat exchanger and insulation
– Diaphragm safety valve
– Operating and maintenance instructions
– Optional: Selfa electric heating element