What are Grandee Condensing Boilers?
Condensing boilers are very high efficiency appliances with combustion efficiencies around 95%. The extra efficiency compared with a ‘standard’ boiler is achieved by extracting virtually all useful heat from the combustion and flue products. So efficient, in fact, that the flue gases are cooled sufficiently to release their latent heat with the water vapour which is produced i n normal combustion being cooled to the point of liquid condensate. A Grandee condensing boiler would have a typical flue gas temperature of 55°C compared with about 120-180°C in a Grandee standard boiler and about 300°C in many typical oil boilers.
