We should exchange notes on this Dog when we have more data.
Albeit we have had ours running since April, the outside unit was replaced on 2 December when it was "cold", but since then of course it has got "colder".
Early days and I am still tweaking and learning, but there is a very clear relationship between outside temperature and power consumption as you'd expect.
From 3-7 Dec I estimated the mean outside temp at 4.5C; HP consumed an average of 24.7 kWh / £8.87 per day.
From 8-13 Dec I estimated the mean temp at -1.2C; HP consumed an average of 37.3 kWh / £13.35 per day.
At the moment I'm guessing it's using a bit of energy to defrost itself.
Its own performance figures look poor - what I haven't worked out yet is whether they are accurate. There seems to be a very small difference in the flow and return temperatures and I think the sensors might be incorrectly fitted or situated. When there's a bit more data I'll get on to Mitsubishi. The house is warm - I can't see how it would get warm enough if the temp drop across the loops was as low as is reported (about 2 degrees).
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