Thank you for the feedback. As far as the heating is concerned, I am now initially satisfied as well. We will see what temperature ultimately comes out; the important thing is first of all that the possibility exists to optimize it. The 20° design temperature in the living rooms is quite tight anyway. However, with the distances now in place, it should not be a problem to get higher here.
Who do you ask with a 40°C fever? The doctor's assistant? Or the doctor?
Who is who for you? I was simply scared that the planners would plan something and the craftsmen would build accordingly. That a heating installer would say, "What kind of nonsense is this, I’ll just do it properly!" I did not expect. I could have saved myself the trouble beforehand.
A nice other example: The outside water tap was planned by the planner directly in the middle of the wall on the terrace. Where furniture is placed against the wall, larch as decoration on the wall, water then stays on the terrace decking ... And when you want to water the garden, you always have a hose lying over the garden furniture. I noticed it "in time" (that is, before completion of the sanitary installation).
End of the story: Open plastered wall, remove pipes, close up, plaster (inside and outside), drill new holes somewhere else in the finished plastered wall, chase wall for pipes, lay water pipes, close wall again and plaster. It cost me a total of €300 and I was very annoyed with the planner. But if I had told the planner to plan the water tap in a different place, he would probably have charged an additional €500 for planning effort. And because of such idiots, the craftsmen then have to do the work twice: disgusting.