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Latest PHPI magazine came out a few days ago and reminded me of another company who make Air/Ground source heat pumps.
These heating systems only need an electricity supply, so in answer to the OP,
NO, IT DOESN'T HAVE TO BE GAS !!!
for more info go here:
http://www.viessmann.co.uk/products/renewableenergy/heatpumps/
They have an easy to follow .pdf document explaining how their systems work which is really useful |
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