If you mean copper pipes, I don't think that heat pumps save anything. In addition nowadays there are plastic pipes that may actually be superior to copper (no

If you mean copper pipes, I don't think that heat pumps save anything. In addition nowadays there are plastic pipes that may actually be superior to copper (no corrosion and they are cheaper). My point is that if electricity is effectively free then there is no incentive to invest in energy saving. The same goes for any resources. In any case, I don't think it is a realistic prospect to expect electricity to become effectively free at least in the medium term.