These heaters are used to heat domestic water in water heaters with a capacity of between 80 and 140 liters. The heating devices support water heating in heat exchangers during the heating season, and independent water heating during the off-season.

The heater has a temperature regulator which enables to retain required water temperature. The device is also equipped with overheating safe-guard (against boil of water in tank) which switches the heater off in case of emergency.

Properties:
- 2 kW power, with 1 1/2" connection, immersion length 370 mm
- 3 kW power, with 1 1/4" and 1 1/2" connections, immersion length 360 mm

In the case of water heating systems in which the glycol (propylene- and ethylene glycol) dilution does not exceed 10%, the electrical heating element can be used, with the use of an inhibitor additive.