In contrast to conventional boilers , like oil boilers , condensing boilers possess an additional heat exchanger located in the flue.
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Why Every Household Should Consider Condensing Boilers | High …
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Tuesday, November 22nd, 2011
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Unlike conventional boilers , such as oil boilers , condensing boilers possess an extra heat exchanger situated in the flue. The fumes, smoke, etc, called flue gasses heat up the water or the air when it's feed into the boiler .
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Condensing Boilers. What we need to Know About Them …