Traditional gas boiler discharges hot flue gases directly into
the atmosphere, and in doing so throw away a considerable amount (nearly 25%) of
heat which has been generated at a cost.
The condensing boiler is designed to extract more heat from a same quantity of
gas than is possible when using traditional boilers. Hence saving gas and money
in the process. This increase in efficiency of the boiler is obtained by
retrieving most of the heat from the hot flue gases which would otherwise have
gone to waste.
The Condensing Boiler uses a secondary heat exchanger or condensing coil to
recover heat from the hot flue gases. In gas combustion heat is produced along
with water vapour (steam) and mixture of carbon & Nitrogen oxides. The
temperature of this flue gas will be near to that of flame.
The flue fan draw the hot flue gas through the primary heat exchanger (the main
heat exchanger as in the traditional boiler) which is situated over the flame.
The system water is heated when it passes through it and fed to the radiators.
The returning water from the system after circulating through the radiators will
be at low temperature. This low temperature returning water enters the secondary
heat exchanger. Which is heated by the hot flue gas that went through the
primary heat exchanger. The water in the secondary heat exchanger will now
recover some heat that normally lost on standard boilers.
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