Underfloor heating air-water heat pump. House too warm when the sun shines

The door to the bathroom must remain open, that is the requirement, door to the bedroom closed. She can’t reach 21°C in the bathroom, significantly more in the hallway.

Then I'll wait for the table... Again about the bathroom. I see that critically, 3 exterior walls, roof and floor, hardly any adjacent heated room, probably no underfloor heating under the bathtub and shower either. So little heating surface for the room with the highest heat demand. A wall heating should have been installed here to cover the heat demand. At least you can heat as needed with the towel radiator. Do you leave the door to the hallway open? I would do that during unused times so that heat can flow from the hallway into the bathroom.

To get 22°-23° in the bathroom with 3 exterior walls, you will have to end up somewhere between 22.5° and 24° in the hallway. But I agree with you. First coarse tuning, then fine tuning. I have been feeling my way for over 2 years because the settings you make now do not necessarily have to be right in the middle of winter. No idea how it is with other heating systems, but with mine I can shift the heating curve up or down in parallel at the heating unit and adjust the steepness of the curve. For me, for example, the steepness of the curve did not fit at all. I started optimizing in autumn and found a good setting for all rooms. In winter, it suddenly got way too warm. So I shifted the heating curve down a bit again. Then it was right in winter, but too cool again in spring. So I raised the curve again, but reduced the steepness a bit. You can only really test this the following winter. With decreasing moisture in the house, in my opinion, the temperature also changed a bit, especially since the ventilation losses were less for us then.