What is a condensing boiler and why is it energy efficient?
A condensing boiler is a hot water heating device designed to recover energy normally lost to the atmosphere through the flue. When a condensing boiler is working at peak efficiency the water vapour produced by the burning of gas or oil in the boiler condenses back into liquid water – hence the name ‘condensing boiler’. The condensation of these exhaust gases releases the latent heat of vapourisation of the water, in effect this used the flue gases to help heat the water within the boiler.
