Heat pumps are NOT green. They use electricity that is about 30% efficient from station to home.
They are horrendously expensive to install. The running cost is about the same as a gas condensing boiler which is "very" cheap to buy in comparison. They tend to work better on low temperature heating and in many cases cannot produce hot enough water in winter for DHW. Working continuously they can over-cool the ground around and have to be switched off to allow the ground to recover.
A minor plus point is the no maintenance. Well not quite right as the inhibitor in the loop needs periodic attention.
The do have their place, but only in remote areas. The sums have to be done properly beforehand before going heat pump. Mabny people go for them because it is a fad.
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