Reply To: Ground Source Heat Pumps

[burton]

Thanks, I hadn’t realised that a higher output temperature dropped the efficiency of the pump. At a COP of 1, presumably running costs would be similar to our existing electric heaters.

If we accepted that the purpose of the heaters was to stop the house being cold, rather than actually making it warm, presumably we could push up the COP? I feel like one advantage of the thick stone walls is that if we can keep some heat in them, they act like storage heaters, albeit ones which put a decent chunk of their heat out into the garden.