Fit a heat pump or else face a £15,000 fine and 12 months in jail in Today's News Posted September 16 30 minutes ago, Mono Inc said: I had a ground source heat pump fitted 3 years ago. It's paid for its self and I'm saving a considerable amount of dosh. Mono Inc prepares herself for a barrage of flying shit. I'm genuinely curious as I don't know anyone who has one of these. How much did it cost and how much does it cost to run? How have you found it?