What Is A Condensing Boiler?

A Condensing boiler is one which uses a heat exchanger to absorb heat that would escape into the flue in conventional boilers. Because the heat in the flue is reduced in comparison with a conventional boiler condensation is created in the flue and this means that these boilers must be connected to a drain to collect water which will trickle out. The boilers are also known for "pluming". This is the ejection of steamy clouds from the external vent which is most obvious on cold and damp days. In the UK domestic boilers are all given a SEDBUK rating. SEDBUK is an acronym for 'Seasonal Efficiency of a Domestic Boiler in the UK'. The ratings are expressed on a scale of A to G with A being the most fuel efficient. Most condensing boilers are "A" banded and it is now mandatory (with some exceptions) in the UK to install these more fuel efficient boilers when installing a new or replacing an old boiler.