Hydraulic balancing and instruction in heating

Next winter: set all thermostats permanently to max/remove them.

Most actuators consume power when "open" and are powerless when "closed." If such actuators are installed, it is more sensible to remove the actuators from the valves and set the ERR to zero/star. This way, the actuators are closed and therefore powerless.

If actuators are installed that are powerless when open, then setting them to max also works.

But that will completely kill your temperature difference, and a temperature difference between 4-5k would be optimal.

No. His Panasonic controls the flow rate itself depending on the specified temperature difference, but needs less pump power with low resistance. High flow is important for defrosting. In any case, this is how the 5kW model works. His 9kW pump, as far as I know, has the same software. My point was that during balancing, he does not throttle down all circuits, but does the opposite. The optimal temperature difference depends on the refrigerant; 2K is also no problem here and will occur during the transitional period. Unfortunately, the OP installed the 9kW heat pump. Without having checked, I assume that it cannot modulate down to low power as extremely as the small 5kW model, which probably would have been sufficient here.

Most actuators consume power when "open" and are without power when "closed." If such actuators are installed, it is more sensible to remove the actuators from the valves and set the ERR to zero/star. This way, the actuators are closed and therefore without power.

If actuators are installed that are without power in the open state, then setting to max is also possible.

Correct. That is why it is better to remove them. I was only talking about the hydraulics here. With an active ERR, balancing becomes impossible, the flow temperature may have to be increased, and the flow rate decreases (pump current, possibly errors during defrost).

Thank you for your responses and the many suggestions. Our actuators are "closed" without power, so hopefully next winter the "take it out" option as described by Musketier. Yes, we (unfortunately) have the 9kw device in the H version. Fortunately, we do not have a buffer tank. Maybe there will be something worth reporting when the heating specialist has been here at the end of the week.