Active cooling without individual room control

My heating engineer had proactively suggested installing an ERR with a sensor in the main room to comply with the energy saving ordinance. It can then either always be turned up fully, or after installation I remove the actuators and let the ERR die a beautiful death on the wall...

Isn't it actually the other way around, that you can do without an ERR in the control room? Sometimes an exemption is possible, but it didn't work for me either.

Now I feel more confused than before. We have an air-to-water heat pump, so only active cooling is possible. ERR must be in every room according to the Energy Saving Ordinance, unless the room is smaller than 6 sqm.

And if we now assume that we have an exemption permit, I was wondering what advice we should give the heating engineer to ensure that we can properly heat with the heat pump in winter and cool in summer.

Try googling "Bautechnik der Bauministerkonferenz zu § 14 Abs. 1 und 2 Energieeinsparverordnung 2013".

Now I feel more confused than before. We have an air-to-water heat pump, so only active cooling is possible. [...]

Isn't it rather passive cooling when you send cold water through the underfloor heating?

Isn't it rather passive cooling when you run cold water through the underfloor heating?

No, an air-to-water heat pump has to actively cool the water. Passive cooling only works with a geothermal heat pump, where the heating water is simply cooled with the cooler water from the ground.

And if we now assume that we have an exemption permit, then I was wondering what advice should be given to the heating technician so that we can properly heat with the heat pump in winter and cool in summer

Flow temperature 30 degrees, room-specific heating load calculation, adjusted pipe spacing, as much heating surface as possible in the bathroom, possibly wall heating in the bathroom. Appropriate supply line to the distributors. Hydraulic balancing, deactivate ERR.