The term ‘condensing boilers’ refers to the fact that the boilers produce condense
from time to time.
Condensing boilers use heat from exhaust gases
that would normally be released into the atmosphere through the flue.
To use this latent heat, the water vapour from the exhaust gas is turned into liquid condensate.
condensing boilers use a larger heat exchanger,
sometimes called a secondary heat exchanger.
Due to this process,
condensing boilers are able to extract more heat from the fue.
it uses than a standard efficiency boiler.
It also means that less heat is lost through the flue gases.
Worcester’s Greenstar condensing boilers are at least 90% efficient,
meaning that they turn 90% of the fuel they use into heat.
The official rating for boiler efficiency is the ‘SEDBUK’ scale.
Greenstar condensing boilers achieve the highest
possible efficiency category – SEDBUK Band ‘A’.
What is SEDBUK?
The SEDBUK rating was developed under the
UK Government’s ‘energy efficiency best practice programme’
with the co-operation of boiler manufacturers, including Worcester.
The SEDBUK rating is the average annual efficiency achieved in typical domestic situations.
It takes into account sensible assumptions about climate, control,
pattern of usage and other similar factors.
The rating is calculated from laboratory tests together with other
important factors such as boiler type, fuel used, ignition type,
So, for estimating annual fuel running costs SEDBUK is a better guide
than laboratory test results alone.
The boiler’s performance is scored,
enabling the boiler to be placed in a banding system using a scale from ‘A’ to ‘G’.
‘A’ rated boilers are the most efficient.
SEDBUK was introduced in 1999 and has undergone a number of changes since then,
the latest being from SEDBUK(2005) to SEDBUK(2009).
Where boiler efficiency is quoted simply as ‘SEDBUK’
it should be assumed this refers to SEDBUK(2005).
Condensing boilers regulations
Building regulations that have come into force since 1st April 2005
state that any replacement or new gas or oil boiler must be condensing boiler.
Rare exceptions may apply.
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Duval Heating 1985 - 2019