Oh, I see, and I agree that is certainly a concern. I don't have any way of running the heat pump if we lose mains power. I would like to get a generator but as you say, it would need to be a big one.
My back up plan for such an eventuality is that I have retained the oil burner that we used before getting the heat pump. It is still connected, we have some fuel for it and we could use it if needed. It does require some electrical power, but very little, and I can supply that from a 12V battery and an inverter. I run it now and then to be sure it is still in working order.
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