The THERM 18 condensing boiler series combines top technology, based in the latest findings in the field, and state-of-the-art components allowing active control of the combustion operation with regard to gas consumption, preventing unnecessary energy loss. The boilers have stainless exchanger with cooled front burner wall. The new type of the gas valve in combination with the burner provides a high level modulation. The regulation ratio of this type of boiler is then 1:10 and the minimum output starts at 1.8 kW. The boiler represents the PREMIUM Condens series with superior technological design.

Thanks to the broad range of output modulation, from 1.8 kW to 19.0 kW, the boilers are designed to be used in low-energy buildings with low heat loss. The THERM 18 KDZ version includes an integrated three-way valve and thus allows for heating household water in an indirect heating reservoir, in addition to central heating.


Recommended retail price: on request

eu_flagThe product THERM 18 KDZ 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 6 View the ErP label
  • The built-in three-way valve has the option to heat the water in an external storage tank
  • The product is designed for heating systems and for heating household water in an external storage tank
  • Exceptionally ecological operation – Class NOx 6
  • Condensing body with a brand new type of boiler: BLUEJET®
  • Broad modulation range: from 1.8 kW to 19.0 kW
  • New design of a multiphase fan
  • Noise reduction at higher speed
  • Electrically modulated SGV gas valve
  • Modulated high-efficiency circulating pump
  • New control unit with auto-diagnostics
  • The electronic system receives feedback about the status of burning and performs optimisation of the program map
  • Suitable combination with the floor heating system
  • Boiler communication and regulator via OpenTherm+
Technical data Unit THERM 18 KDZ
Class of seasonal energy efficiency of heating - A
Nominal thermal input power kW 18.0
Min. – max. thermal output for heating kW 1.8 - 19.0
Max. thermal output for DHW kW 17.5
Fuel - natural gas / propane
Gas consumption - natural gas m3/h 0.181 - 1.749
Gas consumption - propane m3/h 0.070 - 0.711
Min. – max. overpressure of heating system bar 0.8 - 3.0
Maximum input pressure of heating water °C 80
Boiler efficiency % 99 - 106
Volume of expansion unit l 7
Nominal supply voltage / frequency V/Hz 230/50~
Auxiliary electricity at rated heat input W 68.2
Level of coverage of electrical part - IP 41 (D)
Diameter of smoke flue mm 60/100, 80/125, 2x80
Dimensions: height / width / depth mm 725 / 430 / 280
Weight of boiler kg 28
Order number - 10106