Thursday, November 17, 2005

'Factor 6' Solution: the condensing boilers

The average efficiency of non-condensing gas boilers running in the EU is about 70% where condensing boilers can achieve 95% efficiency (based on higher heating value). Taking the view that the heat output from the boiler is an energy service provided to the building, the energy consumption of the boiler is its energy loss, which in this case reduces from 30% to 5%. Condensing boilers are a standard solution in the Netherlands (almost 100% market share), and growing fast in Germany, Denmark, Switzerland, Austria and Belgium, where the share is currently around 30-40%. In other countries, such as UK and Italy, the use of condensing boilers is much lower (source MAMPAEY).

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