• Yeah I get that, it was the comparison between electric direct and electric boiler feeding a wet system that I found interesting.

    Your HP will pretty much be 1:1 in the middle of winter when you need it most, no?

    At least 1:4 isn’t the minimum efficiency they run at, is it?

    Fwiw to get either to feel like a really great solution I think you need solar panels to feed them and a really well put together house.

  • No not at all.
    The HP I'm installing is a Viessmann Vitocal 222-A 8kw unit and COP is still 2.89 at air -7/ system temperature +35.

    COP is 4.71 at air +7/ system temperature +35.

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