The control of THERM EL 8 electric boilers is designed so that the control is simple, easy to understand and unique. The simple operation is supported by a user-friendly three-digit display featuring a unique signalling series of light LED diodes. The THERM EL 8 boiler can be connected to an indirect heating storage tank for heating utility water. The storage tank is heated by adjusting the three-way valve. The boiler is controlled by the room thermostat and an equithermal sensor resulting in further saving of financial funds for electric energy.

The boiler can be controlled through the GSM module via SMS. SMS can be used to remotely set all user settings. This also enables return messaging of operating and error information. The electric boiler also operates with a rate switch, which runs the boiler at a reduced rate. The advantage is the option to add monitoring of the maximum current in order to prevent overloading of the electricity network in the building.


Recommended retail price: on request

eu_flagThe product THERM EL 8 complies all legislative, safety, healthy and environmental requirements of the European Union and CE mark enables the free movement of products within the market of the European Economic Area.

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  • Quiet operation due to selected switching relays
  • Fluent regulation in low steps by 2.5 kW
  • Minimum output of the boiler 2.5 kW
  • Option to connect regulator with OpenTherm+ communication
  • Regulation option according to the spatial or outdoor temperature (equithermal regulation)
  • There is also the option to heat water in an external reservoir and to fit with a three-way valve
  • Option to control the boiler via SMS messages after fitting with SMS module
  • HDO communication - remote switching of the operation to a low rate by the electricity supplier
  • Option to add monitoring of the current maximum to prevent overloading of the electricity network in the building
  • Option to connect up to 32 boilers to an intelligent cascade boiler room to increase heating output
Technical data Unit THERM EL 8
Class of seasonal energy efficiency of heating - D
Nominal heat output kW 7.5
Minimum regulation level of the output W 2 500
Rated current (single-phase connection) A 11 (33)
Level of electric coverage - IP 40
Supply voltage / frequency V/Hz 3 x 400/230 + N + PE/50 ~
Maximum rated current A 3 x 12 (1 x 36)
Main circuit breaker for electric installation A 16 (40)
Rated current of the control circuit breaker A 1.25
Electric service life of relay - 1.105 cycles (16 A, 250 V/50 Hz)
Mechanical service life of relay - 10.106 cycles
Input - output of heating water - G 3/4" outer
Min. – max. working overpressure of heating system bar 0.8 - 3.0
Maximum temperature of heating water °C 80
Water volume of the boiler l 14.5
Efficiency at the rated power % 99.5
Volume of expansion tank l 7
Dimensions: height / width / depth mm 820 / 475 / 238
Weight of the boiler without water kg 37
Order number - 1601