On Friday, October 2, 2020 at 7:17:36 PM UTC+1, Andy Burns wrote:
Martin Brown wrote:

If you can design it in as underfloor central heating and get the
building insulation very very good then you might have a chance.
They are both Plan A
I have a friend, newish build. His second hand air source pump failled. He was going to buy a new one, £10k, with a life expectancy of 10 years.