• Our ASHP has just kicked in to heat the house for the first time this week, giving a CoP of 5 so far, which matches the manufacturer’s spec charts, and this is without insulation yet fitted to the outdoor flow/return pipes, and with a few bedroom windows open. Entire house at a constant 21deg.

    Vaillant Arotherm Plus 7kW, mix of UFH & rads, no buffer/volumiser or thermostats, whole house as a single open loop, pure weather compensation mode.

    We’ve run out of cash so prob gonna spend this winter without the external wall insulation planned for the side of the house.


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