Boiler efficiency is
rated as a percentage assessing how much of the fuel that
they consume is converted to heat. This rating is called
SEDBUK - Seasonal Efficiency of Domestic Boilers in the UK
and represents the average annual efficiency achieved in
typical domestic conditions.
SEDBUK was developed under the UK Government’s Energy
Efficiency Best Practice Programme with the involvement of
boiler manufacturers, and provides a consistent basis for
the comparison of the energy performance of different
simplify the assessment SEDBUK ratings are from A to G,
A-rated boilers being more than 90% efficient. Only A
rated boilers - having efficiencies of over 90% carry the
energy saving recommended logo.
Boiler efficiency is important to you. Not only does an
efficient boiler produce less CO2 it also consumes less
fuel for the same heat output - this will reduce your gas
Remember the purchase price is paid once only, the
heating costs are paid every year and any saving is
repeated year after year.
When Traditional boilers burn gas to producing heat for
heating your water and radiators they eject waste gases
through the boiler flue. These waste gases can be
120-200ºC and hence the system is inefficient ejecting
significant heat to the atmosphere. This is energy you
have paid for.
Modern condensing boilers have large heat exchangers
designed to extract the heat from these hot flue gases.
Current heat exchangers can reduce the temperature of the
ejected gases to below 100ºC and sometimes as low as 50ºC
for the most efficient. This extracted heat is used to
heat your home and improves the SEDBUK measured efficiency
of the boiler to over 90%, a SEDBUK A rating.
For this reason you should ensure that the new or
replacement condensing boiler that you purchase is an ‘A’
rated boiler on the SEDBUK scale. In addition to saving
money over the life of the boiler you will also be helping
to reduce the impact of global warming on the environmen
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