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GAIA Host Collective
You can buy ground source and air source heat pumps that put out via an exchanger 1:3 to 1:5 energy in for heat output (of course they take the heat from the air or ground). I've been lookign at a DIY one in the UK:
http://www.cooleasy.co.uk/product-wall.htm eg 1Kw elec. in, 3.3-3.6Kw heat out
The problem is that natural gas is still very much cheaper than electricity (in the UK anyway) for heating your house/water so these devices would only become viable if the price of the heating fuel relative to that of electricity was to go up. OR// if you have no natural GAS!
This device seems to be achieving the same result (if not quite as efficient) as the heat pump idea - except they don't know where the extra energy is coming from in this case.
Marco.
Furthermore the article says 'heating bills could be slashed in half' - this would only be the case if your house/water was heated by electricity alone. Most people I know in the UK gave up electric (white meter) heating in the late 80's and switched to GCH/OCH.
Marco.