The EERs are all disconnected. Can you still explain how to do a thermal balancing?
Say goodbye to the idea that the heat pump heats individual rooms. Imagine your entire house with the rooms as one large water circuit. For each room, you have an adjustable access that determines how much water flows through in what time. The entire circuit is heated to one temperature. To bring a room to the desired temperature, depending on the room size, you have to let in a certain amount of water. If all rooms are the same size, that’s no problem, you simply let the same amount of water in everywhere. But rooms are always different sizes, so you have to let in the appropriate amount for each room. You regulate this via the access (distribution box of the underfloor heating, here you can set the flow). Unfortunately, it is the case that not enough water fits into some rooms to heat them to the desired temperature (mostly bathrooms because these are small and higher temperatures are desired). Now you can either create space for more water (reduce the installation spacing or use wall heating) or you increase the temperature of the water. Increasing the temperature (this is the known flow temperature) does bring the desired heat into the bathroom, but however, the other rooms also get warmer. So you have to reduce the amount of water here until you reach your desired temperature. This is called thermal balancing. However, the problem now arises that at low outdoor temperatures the heat is no longer sufficient. You could now increase the amount coming into each room, but then you would have the problem that you have to adjust everything exactly again so it fits, and you are also limited by the smaller rooms where no more water can go in. But our heating system knows due to the outdoor sensor that the temperature outside is dropping. So it increases the flow temperature to compensate. Since before all rooms were adjusted to their correct temperature during the thermal balancing, this works. This is the heating curve of the heating system; it contains how much the flow must be changed when the outside temperature changes. This is now a simplified representation, but it depicts the basic function.
