Wall mounted gas condensing boilers are particularly suitable for use in new buildings and small apartments. These extremely compact appliances can fit in virtually any space. They are used either solely for DHW heating or for space heating as well. In the case of the latter, they are referred to as combi boilers. Both versions work according to the instantaneous water heating principle. They therefore do not usually have a storage water heater and only heat water when it is needed. This means that they react very quickly to changing requirements. The disadvantage of DHW heating using the instantaneous water heating principle is that hot water is not available immediately. To avoid having to run water from the tap for a long time before it gets hot, some wall mounted gas condensing boilers have a small integral storage water heater.
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Floorstanding gas condensing boilers take up slightly more space. This is mainly because they have a larger storage water heater in which the heated DHW is kept at a constant temperature for a longer period of time. This is particularly efficient if larger quantities are needed on a regular basis.
If there are plans to connect a solar thermal system for DHW heating, we recommend choosing a floorstanding gas condensing boiler with integral solar indirect coil. This is mounted on the buffer cylinder or near the draw-off point and heats the DHW. In combined systems such as these, there is no mixing of heating water and DHW. The floorstanding units are already designed for dual mode operation. This means that they can easily be combined with another heat generator to cover the heat demand. In terms of technology, Viessmann gas condensing boilers are state of the art and cover an output range of around two to 100 kilowatts (kW). This enables them to efficiently and reliably supply heat to detached homes, two-family houses and small apartment buildings at all times.
Floorstanding gas condensing boilers are also available in larger sizes. These are mainly used in buildings with a high heat demand, typically apartment complexes, public buildings and commercial premises. Thanks to the cascade function, several appliances can be quickly connected to form one unit and provide reliable heat in this area too.
In Germany alone, there are still around two million heating systems in use today that are more than 25 years old. By replacing these boilers with highly efficient gas condensing boilers, consumers can save a lot of energy –– as much as 35 percent when a modern gas heating system is used alongside solar technology. This would translate into ten percent of Germany's total energy needs, with annual CO₂ emissions being reduced by up to 54 million tonnes at the same time.
The savings are made possible because condensing technology uses energy extremely efficiently. This is due to the fact that it converts virtually all of the energy content of a fuel into heat. So anyone opting for a gas condensing boiler, for example, is able to keep their heating costs low in the long term while reducing the burden on the environment. After all, less combustion also means fewer CO₂ emissions.
All Viessmann gas condensing boilers meet EU-wide requirements for efficient condensing technology. 98 percent or more of the energy spent is converted into heat. With such unbeatably high levels of efficiency, anyone opting for one of these gas heating systems is making a positive contribution to protecting the climate and the environment.
As already mentioned at the beginning, one of the advantages of gas condensing technology is its high level of compatibility. In practice, this means that most gas condensing boilers come from the factory already prepared for combined operation. The combination of gas condensing boiler and solar thermal system has proven to be very ecological and economical. In this configuration, the solar thermal system is responsible for DHW heating using the free solar energy. This means that the gas boiler does not have to do so much work. This also reduces heating costs.
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Combining with a heat pump is another possibility. In this dual mode operation, the heat pump not only provides domestic hot water the whole year round, but also heating. If peak loads occur when the weather is very cold, the gas boiler is switched on as well.
It is also possible to operate a gas condensing boiler with a biomass heating system. Be it a log boiler, pellet boiler or woodchip boiler: here too, the gas boiler only needs to be switched on if there is an unexpectedly high heat demand.
When it comes to the commercial heating sector boilers are mostly to be found in plant rooms where they will either be wall mounted or floor standing. Wall hung commercial condensing boilers are by far the most popular option, but your choice of mounting should always be based on each site’s particular layout and requirements.
Only boilers specifically designed to be wall mounted can be so, and only if the walls are suitable. That’s mostly because there is a limit as to how many kilowatts (around 160) you can put into a boiler and still safely wall hang it. Anything bigger than this and the size and weight of the boiler means wall mounting becomes unfeasible. But this doesn’t necessarily mean that you are restricted in output as you can wall mount several boilers in cascade, where the boilers work together to achieve the same output as single larger boiler. You can read about the benefits of a boiler cascade system here.
Wall hung boilers have the advantage of a compact footprint which is a major selling point. Where head room is restricted though, a floor mounted boiler could be a better option as they are generally much lower than a wall mounted boiler.
There isn’t a straight forward yes or no answer to this question as it very much depends on the site and whether you are installing one floor standing boiler versus several smaller boilers in cascade, for example. However, one answer that is nearly always a yes, is when it comes to plant room access. As wall hung boilers have a smaller capacity and are therefore smaller in size, they are easier to manoeuvre through smaller spaces.
The good news about wall mounted commercial boilers – certainly Ideal Heating ones - is that they can be installed with either concentric or open-flues. Floor standing boilers are typically more suited to open-flu instals only, which require a flu specialist. Concentric flues, where the air supply and flue gases are managed within a one-piece sealed concentric duct system, on the other hand, can be fitted by any gas safe installer.
At Ideal Heating, we provide a comprehensive range of UK manufactured commercial condensing boilers that can be wall mounted. Our Evomax 2 is the UK’s number 1 wall mounted commercial boiler, with market leading availability; it outsells every other comparable boiler in the UK!
Where wall mounting is not suitable, as you’d expect, we also have a comprehensive range of floor standing option, such as the Imax Xtra 2. It is compact in size and comes on wheels, making it easy to install and easily fit through standard doorways. It can be cascaded up to four boilers for up to kW output.
Contact us to discuss your requirements of wall mounted condensing gas boiler. Our experienced sales team can help you identify the options that best suit your needs.