Condensing boilers are water heaters in which a high efficiency (typically greater than 90% on the higher heating value) is achieved by using the waste heat in the flue gases to pre-heat the cold water entering the boiler. They may be fuelled by gas or oil and are called condensing boilers because the water vapour produced during combustion is con...
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http://en.wikipedia.org/wiki/Condensing_boiler
A type of boiler that uses an additional set of heat exchanger tubes to achieve very high efficiencies (typically more than 90 pecent). The term 'condensing' comes from the fact that heat is recovered successfully from the flue gases such that they are cooled to a temperature where the water vapor s...
Found on
http://www.daviddarling.info/encyclopedia/C/AE_condensing_boiler.html
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