Frankly speaking … until now … I was under impression that weather dependent regulation might be the most effective option (it it comes to simple setups). Now, when I give it a second thought … it might be a better option to put a temp sensor in the space (room) I’m spending the most time during the day and use opentherm termostat to control the boiler. I have seen your article describing usage of additional blue tooth temp sensor (if no cables around) and this might get things done from me. However … there is still one thing I can’t stop thinking about. My heating installation is combination of floor heating (one open space downstairs) and radiators on the first floor. Open therm is going to control the boiler to keep my open space (floor heating) temp as close to target temp as possible. Unfortunately radiators require higher temperature than a floor heating and therefore when I get to point where target temperature hits the actual room temperature, the boiler temp will go way lower to what it need to be in order to hit my radiators on the first floor. I guess I will need to experiment a bit to see on how it really goes.