High Efficiency
Condensing Boilers:
 Since
April 2005, there has been a legal requirement that all
new boilers new boilers installed, either in a new
building or as a replacement for an old system, shall be
high efficiency models. There are a very few exceptions
where old type boilers can be installed.
These boilers are
called condensing boilers because they use the hot flue
gases to preheat the return water which is an efficient
way to recover heat from the waste gases exiting the
boiler.
This heat recovery
means that the invisible water vapour in the combustion
gases is condensed back into water which creates a plume
of water vapour (like a cloud). Heat efficiency of these
boilers is rated at 90-91% efficiency. These boilers
reduce gas bills by up to 30%.
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