Your existing boiler will probably have a BTU number (measured in 000's) written on a panel somewhere. It should have been sized accordingly to power your hot water cylinder and radiators / UFH. Once you've got that, visit http://www.discountedheating.co.uk/ for some ideas to price the kit, then www.trustcorgi.com to find an installer. Once happy with an installer, get them to verify that the new boiler is good enough, etc.
Heat pumps still can't get anywhere near gas for unit cost / flexibility in output temperatures. Plus you usually have to dig up your garden to install one (unless you choose an air source one, and they aren't as good as the ground ones).
HTH
Heat pumps still can't get anywhere near gas for unit cost / flexibility in output temperatures. Plus you usually have to dig up your garden to install one (unless you choose an air source one, and they aren't as good as the ground ones).
HTH
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