The THERM 28 KDZ.A wall-mounted condensing boiler is classified into the category of boilers with the connection to an external storage tank, i.e. the option to heat water. The boiler includes an integrated three-way valve for using an alternative heating system and the utility water storage tank. This solution is economical as well as a comfortable way of heating water.

The advantage of the water heating in an indirect heating storage tank is the immediate delivery of hot water and the option to supply more consumption points in real time. The boiler operates in both the summer and winter regime; only the storage tank is heated in the summer regime. The boiler is separately fitted with an energy saving pump and fluent regulation of the output from 6.6 kW.


Recommended retail price: on request

eu_flagThe product THERM 28 KDZ.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
  • Savings on operating costs of up to 30% after replacing the old boiler
  • Energy saving pump – savings on electricity of up to 50 %
  • Use of a new HDIMS 20-TH20 automatic control system
  • Option of regulation according to the spatial or outdoor temperature (equithermal regulation)
  • Fluent regulation of output 6.6 – 28.0 kW
  • Excellent ecological operation
  • Can be easily combined with the system for floor heating
  • The built-in three-way valve gives the option of water heating in an external storage tank
Technical data Unit THERM 28 KDZ.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 46
Order number - 1032.7