Homeowners Professionals

High Efficiency, A-Rated Gas Condensing Boilers

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Convenient heat generation with gas

Our A rated gas condensing boilers offer a highly efficient and reliable heating and hot water solution for your home or business. We offer technologies for convenient heat generation with natural gas that meet a wide variety of requirements. Whether you need a high efficiency condensing boiler for a new building or a modernisation project, we can help. At Viessmann, we provide appliances suitable for use in apartments, single-family homes or major projects in the housing industry. This includes compact, wall mounted models gas condensing boilers that can be installed in almost any room.

If a solar heating system is to be connected to provide domestic hot water, we recommend gas condensing boilers with integrated solar heat exchangers. These 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 blocks, as well as 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.

Gas condensing boilers are more efficient than older non-condensing designs. Equipped with condensing technology, they utilise not only the heat generated by combustion, but also the water vapour content. They transfer this additional heat energy back into the heating system, meaning that more of the money you spend on fuel is converted into heating and hot water for your home or business. Our gas condensing boilers are at least 98 per cent efficient, helping to save you money and cut your carbon footprint.

Using future-proof heating technology  

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 of its gas condensing boilers. Thanks to combustion control, our gas condensing boilers automatically adjust to different types of gas - including biogas admixture. Therefore, these heating systems sustainably meet the requirements for resource-saving heating technologies.

Our range of gas condensing boilers  

Viessmann gas condensing boilers feature a high performance stainless steel Inox-Radial heat exchanger which is central to their impressive performance. This heat exchanger cools flue gases before they escape up the chimney. This process releases extra heat, which is transferred into the heating system. Thanks to this condensing technology, our gas condensing boilers are rated energy efficiency class A and they achieve efficiency of up to 98 per cent. This means they can help you to look after both your finances and the environment.

10-year heat exchanger guarantee

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.

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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