What flow temperatures are you currently running?

However, the throttle causes you to reduce the total flow rate, which in turn leads to cycling.
Giving the bathroom and guest toilet more than 3L/min makes no sense at all.
3L are actually already a planning error...

Not entirely correct, as long as you reduce the volume flow but do not go below the pump’s specified amount, you have better heat transfer.

Here the question would be what costs more energy, a slightly higher heating curve and throttling the other circuits a bit or leaving the heating curve as it is and having an electric radiator in the bathroom

I can somewhat answer that, since we have a rather economical heat pump and electric towel radiators in both bathrooms, which are controlled via KNX and have consumption measurement. My measurement at the time and the subsequent cost estimate showed that using the towel radiator once daily would have increased heating expenses by 15-20%.

We use them as (expensive) towel racks, but we will not heat with them. If it were too cold, I would first try it via the floor heating supply line.

Interesting, I wouldn't have thought that. Although the counter calculation is still missing. How much does 2° more supply temperature cost? Or how much more supply temperature do you need now?

Not quite right, as long as you reduce the volume flow but do not go below the pump's target flow, you have better heat output.

How do you come to a better heat output? The spread increases. My heat pump regulates to a spread of 5K, which means it would then push even more water into the system...

How I come to this read in the forum if I write the name now I get the next warning. But I will send you the link. But for understanding, if the water runs slower through the pipes, you have better heat output or efficiency. By the way, we tried to achieve a spread of 6k on my heating. I simply trust the pros, by that I do not mean the heating engineers.

That makes no sense at all. According to that, I would have to throttle the rooms I want to be the warmest the most....