THERM 28 KD.A wall-mounted condensing boilers provide excellent ecological operation. Due to the output, it is recommended for heating residential houses as an alternative to existing gas boilers. The parameters are primarily designed for low-temperature heating systems for floor heating systems. The boiler unit fluently regulates the output of the boiler and the option to regulate according to the room or outdoor temperature is a matter of course (equithermal regulation).

In addition to the heating, the THERM 28 KD.A boiler can also be used to heat the water in an indirect external heating storage tank using an external three-way valve. Boilers are fitted with an energy saving circulation pump and the consumption of electricity is up to 50% lower than for similar circulation pumps.


Recommended retail price: on request

eu_flagThe product THERM 28 KD.A 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.

Emission category NOx 5 View the ErP label
  • Saving of operating costs after replacing an old boiler
  • Regulation option according to the spatial or outdoor temperature (equithermal regulation)
  • Fluent regulation of output 6.6 - 28.0 kW
  • Use of new HDIMS 20-TH20 automatic control system
  • Energy saving pump – savings on electric energy up to 50 %
  • Strong ecological operation
  • Suitable in combination with the floor heating system
  • There is also the option to heat water in an external reservoir and to fit with a three-way valve
Technical data Unit THERM 28 KD.A
Class of seasonal energy efficiency of heating - A
Nominal thermal input power kW 26.4
Min. – max. thermal output for heating kW 6.6 - 28.0
Fuel - natural gas / propane
Gas consumption - natural gas m3/h 0.68 - 2.85
Gas consumption - propane m3/h 0.24 - 0.93
Min. – max. overpressure of heating system bar 0.8 - 3.0
Maximum input pressure of heating water °C 80
Boiler efficiency % 98 - 106
Volume of expansion unit l 7
Nominal supply voltage / frequency V/Hz 230/50~
Auxiliary electricity at rated heat input W 66.1
Level of coverage of electrical part - IP 41 (D)
Diameter of smoke flue mm 60/100, 80/125, 2x80
Dimensions: height / width / depth mm 800 / 430 / 325
Weight of boiler kg 45
Order number - 1030.7