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Got it, im kinda new to this so learning every day ?

@J1mbo - nice, that proves your COP thesis I believe, at least roughly as you describe it Yes, under-floor heating in concrete and 5 heat exchangers (radiators right?) on first floor. Thankfully they are quite new, so I can run them at lower temperatures. My heatcurve is at 0.65 at the moment, and my inlet temperature is around 37 to 42C depending on weather which is just about enough to keep the house at 22.5 degrees. My installation is quite new, so I am playing with the curve a bit. Also I have a 100L buffertank installed.

Wow, thank you for the explanation. That makes more sense to me now, as my search on this topic has found quite different answers but nothing explained like above. Calculating the COP on my unit (aroTHERM plus 125/6) for February, im landing at around 4.17 which I believe is quite good.

J1mbo I thought that the COP was calculated from Yield/Consumption. Usage directly translated to effect. Could you put a few more words into explaining the calculation if possible? Thanks :)