Vitodens 100-W P25/P29

Wall mounted gas fired condensing boiler with Inox-Radial heat exchanger

Rated output: 5.9 to 29 kW

5 year warranty as standard

Vitodens 100-W P25/P29

Combination boiler

The gas fired condensing boilers Vitodens 100-W P25 and P29 offer high heating and DHW comfort at a good price/performance ratio. 

Suitable for installation in any home where there is limited space, the Vitodens 100-W P25/P29 is ideal for a flat or small family home as it can easily be sited in an alcove in the bathroom, kitchen or utility room. 

When it comes to the economy and durability of a heating system nothing is better than stainless steel. For this reason the entire Vitodens 100-W range is equipped with the Inox-Radial stainless steel heat exchanger, which provides the required reliability and the guarantee of a long life for the condensing boiler. 

Robust burner with long term efficiency
The MatriX cylinder burner developed and produced by Viessmann ensures high efficiency because of its stainless steel MatriX mesh that results in hundreds of tiny flames rather than one large one, which ensures Nitrogen Oxide production is kept to a minimum. 

Comfort control with integrated diagnostic system
The Vitodens 100-W P25/P29 comes with a control unit featuring a built-in diagnostics system and frost protection. When connected to an outdoor temperature sensor the boiler switches automatically to the weather compensation mode, for additional gas savings of up to 12%. The dials are easy to operate and enable fast adjustment of the heating and DHW temperature. 

Extremely easy to maintain and service
Maintenance and service time of this gas fired condensing boiler is minimal due to all components being easily accessible from the front. All components such as hot water expansion vessel, pumps and safety valves are already installed in th product.

Find out how to save up to an amazing 15% extra on fuel bills

Take advantage of these benefits:


  • Compact gas fired condensing boiler, 5.9 to 29 kW
  • Standard efficiency up to 97% (Hs)
  • Energy efficiency class: A
  • Highly durable and efficient through Inox-Radial stainless steel
    heat exchanger
  • Modulating MatriX cylinder burner with high efficiency through stainless
    steel MatriX mesh
  • Easy to operate control with provision for connecting modulating thermostats
  • Outstanding DHW convenience through its integral booster function
  • Manual exhaust gas adaption enables large, maximum flue pipe length
    without any decrease in heat output