SEDBUK - Seasonal Efficiency of Domestic Boilers in the UK, the scheme was developed in conjunction with boiler manufacturers and the government and provides a fair comparison of average boiler efficiency.
The model was developed to be a a more accurate method than laboratory tests alone as the theoretical data from test on 20 boilers in the labs was compared against field trials in 99 homes over a 3 year period.
A clear rating system is now applied to all boilers from A-G, A being the best and most efficient.
Source:http://www.homeheatingguide.co.uk/
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