The KDC.A series of condensing boilers designed for heating the heating system and for fluidly heating water. The water is heated using an exchanger plate, which is part of the boiler. The advantage of this solution for heating water is the low cost price of the equipment. The energy saving pump reduces electricity consumption by up to 50 %. Fluent regulation of the condensing boiler output is a matter of course.

In the case of high hot water consumption, it is recommended to connect the THERM 28 KDC.A condensing boiler and an indirect heating hot water storage tank. Replacing an old gas boiler with a new THERM condensing boiler will save operating costs.


Recommended retail price: on request

eu_flagThe product THERM 28 KDC.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 View the ErP label
  • Saving of operating costs after replacing an old boiler
  • The boiler includes an exchanger plate for the preparation of hot water
  • Fluent regulation of the boiler output 6.6 - 28.0 kW
  • Energy saving pump – electricity savings of up to 50 %
  • Saving of operating costs after replacing the old boiler
  • Option of regulation according to the spatial or outdoor temperature (equithermal regulation)
  • Strong ecological operation
  • Suitable combination with the system of floor heating
Technical data Unit THERM 28 KDC.A
Class of seasonal energy efficiency of heating - A
Energy efficiency class of water heating - A
Declared loading profile - XL
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 47
Order number - 1031.7