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From Wikipedia, the free encyclopedia

Type of water heater

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**Condensing boilers** are water heaters typically used for heating systems
that are fueled by gas or oil. When operated in the correct circumstances, a
heating system can achieve high efficiency (greater than 90% on the [ higher
heating value ](/wiki/Higher_heating_value "Higher heating value") ) by [
condensing water vapour found in the exhaust gases ](/wiki/Flue-
gas_condensation "Flue-gas condensation") in a heat exchanger to preheat the
circulating water. This recovers the [ latent heat of vaporisation
](/wiki/Latent_heat_of_vaporisation "Latent heat of vaporisation") , which
would otherwise have been wasted. The condensate is sent to a drain. In many
countries, the use of condensing boilers is compulsory or encouraged with
financial incentives.

For the condensation process to work properly, the return temperature of the
circulating water must be around 55 °C (131 °F) or below, so condensing
boilers are often run at lower temperatures, around 70 °C (158 °F) or below,
which can require larger pipes and radiators than non condensing boilers.
Nevertheless, even partial condensing is more efficient than a traditional
non-condensing boiler.