I have just had a call from British Gas about my application to have a Heat Pump installed. I told him that I was happy with my existing Rads., but he said I must have bigger Rads. BY LAW. I find this hard to believe. He then quoted me over £6000 on top of Goverment Grant, for a small semi detached Bungalow. This made me wonder what is the size of the house that they are advertising that can be converted to Heat Pumps for under £3000.