What is a SEDBUK rating?
This is a rating which tells the consumer how much of their gas is turned into useful heat output by the boiler (working in ideal conditions). This is normally stated in the manufacturers brochure. The SEDBUK rating is a reasonable benchmark, but it does not take into account a number of other factors such as ‘standing losses’ – which is heat loss when the boiler is cycling on and off. Therefore, not all SEDBUK A boilers are equals in real world situations.
