Tuesday, March 25, 2008
At last month's Eco-build show at Earl's Court, a few stands were promoting ground-source heat pumps. Heralded as a planet-friendly way to heat homes, they work by harnessing heat energy under the ground.One metre below the surface, the temperature is a fairly constant 10C. In most cases, you end up putting in three units of electricity to get out three units of heat.For homes attached to the gas mains, the heat pumps are usually a waste of money. Most experts agree that if a large source of surplus renewable electricity is available from, say, a medium-sized wind turbine or a micro-hydro system, then they could make sense – but this would cost £10,000 to £20,000.
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by cedar @ 8:24 PM
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