"Ice Energy has forged a partnership with power generating company nPower to offer a £1500 grant on all domestic installations of heat pumps. The grant is not means tested and there is no obligation to use or purchase any npower products. As well has homeowners it is available to builders, developers, landlords and Housing Associations."
More details at
http://www.iceenergy.co.uk/grant.asp
Cost with grant is about £4K, plus drilling or trench costs. This compares well with £3K quoted by British Gas to replace boiler, particularly when energy consumption of a GSHP can be as low as 1/4 of that of gas powered underfloor heating (radiators slightly less efficient) - or, when you take into account green 'leccy being twice the cost per KwH, half the annual cost and no annual servicing.
Low Carbon grant for GSHP is only £1,200, so this is a better option for this brand of GSHP.[/url]