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| 3. CONDENSING SYSTEM BOILER Most types of boiler are also available as high efficiency or "condensing" boilers. There are high efficiency combination boilers, system boilers, or conventional boilers. The term `condensing' or high efficiency applies to the technology which is used to maximise boiler efficiency to use less fuel for more heat. A condensing boiler is a high efficiency modern boiler that incorporates either a larger heat exchanger or even a second heat exchanger. It produces lower flue gas temperatures, lower flue gas emissions, and reduced fuel consumption . It typically converts more than 88% of the fuel used into useful heat, compared to, typically, 78% for modern conventional types. By recovering and using heat that would otherwise be lost up the flue the best high efficiency boilers can operate with seasonal efficiencies in excess of 90%. Recovering the heat from the flue reduces the temperature of the flue gases to a point where water vapour produced during combustion is 'condensed out'. Thus the name high efficiency condensing boiler. A side effect is that this 'condensed out' water, known as condensate, which is usually acidic, has to be piped away to a drain or soakaway. All condensing boilers will produce 'pluming' from the flue terminal which appears as steam. This pluming can drift into neighbouring property causing annoyance and possible condensation on window glass or frames so careful consideration should be given to siting of the flue terminal especially if it may effect neighbouring property.  |
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