Ah, like this. Now I got it. Yes, this is interesting idea. Yes, there are many ways how to do it, probably will check something but now seems there is no issue with it.
Anyway, my plan is to buy modbus and make a java application which will run on Raspberry Pi and constantly monitoring parameters read from modbus. After evaluation I will program logic to set the weather curve flat when temperature is +5C and above. Either 40 or 45C. This will give me much better COP than keep it running on minimal power with fan barely spinning. And probably I will integrate some weather provider API to change the curve when there is a sunny day.
I can’t agree with this statement. This is truth only if you have well dimensioned pump which can cover your heat needs across all weather conditions and best with floor heating. Especially when freezing this is ideal, yes, but…
…I’ve clearly proved that in warmer climate, with radiators… to let it run constantly is inefficient. My COP at +12C is the same as COP at 0C. The only advantage is the thermal stability but that’s it. And very silent work of the outdoor unit which maybe not good for fun at the other hand. Even running the water at 50C would be more effective than this. I would expect at least COP4 at 12C…