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A condensing boiler is a type of boiler that has increased efficiency, with an average efficiency of 82-89% in a real house installation (although laboratory tests claim up to 95-98%), compared with an average efficiency of 50-80% with a non-condensing boiler. This increase in efficiency is possible because the boiler re-uses the heat of the flue gases and vapours to heat up water, thus wasting less energy. The flue gases typically reach temperatures of 180-200°C, and thus a lot of heat (and therefore, energy) is wasted to the atmosphere. For this to work, the gases must be extracted with the use of a fan to a vent, and for the excess water collected (the water that condenses to release the heat) to be drained away using the usual waste water pipes. All new gas boilers installed since April 1st 2005 (and since April 1st 2007 for oil-fired boilers) are required to be condensing boilers, unless exceptional circumstances apply.