• What is a condensing boiler?

    The term ‘condensing boiler’ 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 boiler

    In order to make the most of the latent heat within the condensate.

    Condensing boilers use a larger heat exchanger, or sometimes a secondary heat exchanger.

    Due to this process, a condensing boiler is able to extract more

    heat from the fuel 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.

    These official rating for boiler efficiency is the ‘SEDBUK’ scale.

    SEDBUK stands for ‘Seasonal Efficiency of a

    Domestic Boiler in the UK’.

    Greencondensing boilerstar condensing boilers achieve the

    highest possible efficiency category – SEDBUK Band ‘A’.

    What is SEDBUK?

    SEDBUK rating was developed under the UK Government’s ‘energy efficiency

    best practice program’ with the co-operation of boiler manufacturers, including Worcester.

    Provides a basis for fair comparison of different models of boiler

    SEDBUK rating is the average annual

    efficiency achieved in typical domestic situations.

    takes into account sensible assumptions about climate, control, pattern of usage and other similar factors.

    rating is calculated from laboratory tests together with other important factors such as boiler type.

    Fuel used, ignition type, UK climate,

    boiler water content and typical domestic usage patterns.

    So, for estimating annual fuel running costs

    SEDBUK is a better guide than laboratory test results alone.

     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 boiler regulations
    Building regulations that have come into force since

    1st April 2005 state that any replacement or new gas or oil boiler must be a condensing boiler.

    Rare exceptions may apply.

    To arrange a visit re replacing your boiler with a new condensing boiler use our online booking form












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