Up to a certain point, that is also true. As long as you emit heat, everything is okay. What good is it to me if the return flow is already cold after 5 minutes?
Therefore, the differential of each individual heating circuit should also be monitored. As I wrote above, a flow rate of 3L/min for a heating circuit is actually a planning error.
Raised the heating curve from 0.2 to 0.24, the bathroom is now at 22.4°C with a flow rate of 3l/min, I turned down the other rooms a bit more, I would say around 0.8-0.9l/min. AT in the 24-hour average is 4.7°C - consumption was 13kwh, including 3 times hot water. Heat pump ran 2 cycles in the last 24 hours
I measured the supply and return temperature directly at the heating circuits yesterday. I noticed that the individual circuits have a temperature difference of 2K between supply and return, except for the guest WC where supply = return; I have now reduced the flow there. But that also means that I now have to increase the heating curve and throttle the other rooms even more so that the guest WC gets a bit warm? About 21°C would be good in the guest WC. The floor temperature in all rooms is 24°C, in the bathroom 25°C.
... the guest toilet there is supply = return, I have now reduced the flow there. But that also means that I now have to increase the heating curve and throttle the other rooms even more so that the guest toilet also gets a bit warm?
probably the room "radiators" are installed in parallel?! (so no single-circuit system with bypass?)
yes, throttle in the return. Otherwise, the radiators close to the source take the heat away from the ones behind. If the difference at the radiator is too low, then the radiator is undersized.
Only underfloor heating is installed throughout the house. There are no other radiators. Or what exactly do you mean by installed in parallel? The radiator in the guest WC is quite short with 40m compared to all the others with 70-100m.