Heating with Gas Condensing Boilers 

Viessmann offers various technologies for convenient heat generation with natural gas that meet a wide variety of requirements. For example, for gas heating in new buildings or modernisation, for apartments, single-family homes or for major projects in the housing industry. Gas condensing boilers are particularly suitable for use in new buildings. These are extremely compact and wall-mounted models that can be installed in almost any room.

If a solar system is to be connected for DHW heating, gas condensing boilers with integrated solar heat exchangers are recommended. The floorstanding gas condensing boilers are state-of-the-art and cover an output range from 2 to 100 kW. This enables them to supply heat efficiently and reliably to detached, semi-detached and small apartment buildings at any time.

Condensing boilers with gas are also available in larger outputs. They are mainly used in buildings with a high heat demand. These are usually apartment buildings, public and commercial buildings. Thanks to the cascade function, several devices can be quickly connected to form a single unit and reliably provide heat in this application as well.

The picture shows a gas boiler on the wall

Protecting the climate and the environment - for example with a gas condensing boiler

Combining climate protection and economic relief. This is achieved by using condensing technology. The special feature of this technology is its highly efficient energy utilisation. While conventional heating systems simply let some of the energy contained in the fuel escape unused, the gas condensing boiler converts the energy content of a fuel almost completely into heat. For example, heating with a gas condensing boiler keeps heating costs at a low level in the long term and at the same time reduces the burden on the environment. Because less combustion also means less CO2 emissions.

All Viessmann gas condensing boilers meet the EU-wide requirements for efficient condensing technology. 98 percent and more of the energy used is converted into heat. With this high efficiency, every user of such a gas heating system makes an active contribution to climate and environmental protection

Using future-proof heating technology today

The demands for resource-saving heating technologies are becoming ever more pressing. New gas condensing boilers should not only work cleanly, but also sustainably. In response to this, Viessmann has already invested in the future in its gas condensing boilers. Thanks to combustion control, the gas condensing boilers automatically adjust to different types of gas - including biogas admixture. Thus, the heating systems sustainably meet the requirements for resource-saving heating technologies.

Another argument in favour of choosing a gas condensing boiler is that energy does not have to be stored in the house. The compact gas condensing boilers save valuable living space.

The picture shows a solar thermal system with the combination of a gas condensing boiler.

Combining a new gas condensing boiler with solar collectors

The free energy from the sun for central heating backup and DHW heating is still underused. Every new gas heating system such as a gas fired condensing boiler should nowadays be combined with solar collectors to use free solar energy. 

Using an app to operate your new gas heating system via the Internet

With the ViCare App, you can conveniently operate your Viessmann gas heating system and save energy - at any time, from anywhere. This way you always have an overview of your heating systems operating status.


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Our range of gas condensing boilers 

Efficient gas heating - with condensing technology

Viessmann gas condenser boilers are equipped with condensing technology. This condensing technology not only utilises the heat generated by combustion but also the water vapour content. This enables them to be able to extract almost all of the heat contained in the flue gases and convert it into heating energy.

Central to the performance of Viessmann gas condensing boilers is the high performance stainless steel Inox-Radial heat exchanger. It is the role of the heat exchanger to cool the flue gases before they escape through the chimney. In doing this, the water vapour contained in these gases is deliberately condensed. This releases additional heat which is transferred into the heating system.

The use of condensing technology within Viessmann boilers means they can achieve efficiency of up to 98% and are rated energy efficiency class A. This energy efficiency means you are looking after both your finances and the environment.


Old Boiler Rating
Annual Saving  Carbon Dioxide Saving Per Year 
G (<70%) £310 1,200kg
F (70-74%) £205 810kg
E (74-78%) £155 610kg
D (78-82%) £105 430kg

Courtesy of Energy Saving Trust

Condensing combi boilers

As part of our range of gas condensing boilers, we offer a number of gas condensing combi boilers. Combining a high-efficiency water heater and a central heating boiler in a single compact unit, our condensing combi boilers are an ideal space-saving option for your property.

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The MatriX gas burner

The MatriX gas burner represents a milestone in Viessmann heating technology. The use of the stainless steel MatriX gauze endows it with a long service life. The burner is resistant to high temperature loads.

Gas condensing boilers

With condensing technology, not only is the heat from the combustion of fuel oil or gas utilised, but also the heat that, with non-condensing heating technology, would otherwise escape unused up the chimney. Condensing boilers extract almost all of the heat latent in flue gases and convert it into additional heating energy. To do this, Viessmann condensing boilers are equipped with stainless steel Inox-Radial heat exchangers, which cool the flue gases before they are routed into the stack, to the extent that the water vapour contained within them is deliberately condensed, transferring the additional heat released into the heating system.