What flow temperatures are you currently running?

With an electric HTHK, you will certainly operate more economically in the long run. What I meant to say is that it makes no sense to pump over 3L/min into the bathroom. Do you run the heat pump directly into the underfloor heating or into a buffer?

I have something similar under the actuator, but not a hexagon, rather the "radiator square" for the thing under the pin for the actuator. If I unscrew it, will the flow then increase, or is it simply adjusting the stop of the actuator’s travel?

With my valve, I turned on the return line but did not notice any change in flow.

Put differently, what do you have to turn to remove the restriction?

You can definitely still regulate the flow at the square. However, I haven’t seen a detailed drawing.

This square should be fully opened, and the rest at the Taco; if the flow no longer increases, you theoretically have to throttle other circuits or increase the pump capacity, which can negatively affect consumption again.

With an electric HTHK you will certainly operate more economically in the long run.
What I meant is that it doesn't make sense to push over 3L/min into the bathroom.

Do you run the heat pump directly into the underfloor heating or into a buffer?

Small series buffer tank in the return flow with 18 liters volume.

The nominal volume flow of the heat pump is definitely reached whether I open all heating circuits fully or throttle them to increase the volume flow in the bathroom.

For now, I keep all circuits as open as possible except for the rooms I want 1-2 °C cooler than the rest. The heating curve can't go any lower anyway.

wait until the outside temperature drops. At the moment it is difficult, because there are very high fluctuations daily.

The heating curve doesn’t go any lower anyway.

How about the basepoint? I think at these temperatures it’s still the more sensible knob...

What I wanted to say is that it doesn’t make sense to push more than 3L/min into the bathroom.

Besides, then you also have the risk of a hydraulic short circuit and cycling.

How about the footpoint? I think it's still the more sensible setting at these temperatures anyway...

Besides, then there's also the danger of a hydraulic short circuit and cycling.

The footpoint/desired temperature is at 21°C if both are the same.

The hydraulic short circuit surely depends on the length of the heating circuit, doesn't it? If I push 3 l/min (3 l/min is just an example, in reality it's significantly lower) through a 30 m long circuit, that's equivalent to an open bypass valve. But with an 80 meter circuit, the risk is significantly lower, right? Ultimately, you probably find out when you measure the return temperature.