How efficient are Grandee condensing boilers and what is Sedbuk?
Sedbuk stands for ‘Seasonal Efficiency of Domestic Boilers in the UK’ and is an energy efficiency scheme devised by the government. The Sedbuk ratin si calculated from laboratory tests combined with the type of fuel of an appliance, the climate, the hot water system, whether ignition if automatic or permanent and other such factors necessary to produce a meaningful indication of normal efficiency in typical usage. Sedbuk Ratings See chart on the right. Grandee appliances are Sedbuk rated ‘A’ – the highest grade- though combi units are grade B because an arbitary 2.8% is deducted from all combi units. This methodology is being challenged as unfair and unrealistic by many manufacturers who actually believe, as we do, that combi condensing units are more efficient than separate hot water cylinder storage systems.
