Set the heating correctly

Doesn't really make sense, but if it helps you sleep better, then you can lower it at night.

I mean with the idea that a night setback is set. Because actually, heating should be done exactly at night (efficiently) so that the bathroom is warm in the morning after getting up.

I tested the night setback with us for 2 weeks, but unfortunately it always felt like only the ground floor got colder first, and then mostly only after we got up.

It should say setback in the evening.

Yes, that's exactly what I'm talking about... lowering it doesn't help at all if you want to have a warm house in the morning...

then it doesn't bring me anything at all since I have to get up at 5, then I have to start heating again at the latest by 3 o'clock to get a comfortable room climate back, I would have to lower it from 8 or 9 o'clock, whether that is really a good solution

You have to try it... however, I would say that lowering (whenever) does not bring anything... maybe a little savings in the low single-digit range... but it is simply not worth the effort...

My GWBT has been running in automatic mode (outside temperature controlled) for about 5 years without any reductions... and it is always pleasantly warm in the house with reasonable consumption.

I have now set all room thermostats to 30 degrees so that the control is completely done by the heating system, set the level to 19 degrees, the starting point to 20 degrees, and the end point to 36 degrees. At the moment I have a flow temperature of 28 degrees, the rooms seem to warm up very well, I will observe it like this for a few days.