Gas boilers

Building regulations that came into force on April 1st, 2005 state that any replacement or new gas boiler must be a condensing boiler. Rare exceptions can apply but, for the most part, these are the types of boilers that Domestic & General install.

What are condensing boilers?

Gas condensing boilers have become the standard due to the fact that their system of converting water vapour (or steam) that would traditionally have been expelled through the flue and into the atmosphere into useable heat makes them much more energy efficient than older boilers.

Water vapor is condensed into a liquid condensate that contains latent heat. This heat can then be harnessed and utilized to warm your home, rather than expelled as it may have been previously.

This makes condensing boilers much more efficient that the old-style conventional boilers that preceded them.

Most condensing boilers state that they have a SEDBUK rating of ‘A’ – this means they convert 90 per cent or more of the fuel they use into heat.

Condensing boilers come in three types:


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