Heating pipe bent too much?

what does Schutzschlauch mean, basically another hose over the coupling?

Exactly, so that the [Kupplung] is decoupled from the screed.

I will address directly, thanks, I called Buderus they are sending someone to the construction site for free to take a look at everything there, really great of them

Too early to be pleased, Buderus called me, the company that does this for me is a customer of Buderus and they don't want to deceive them and send someone out, well, that happens too

mmh that's annoying...

The problem with the whole thing is, when you see a bend like in picture 2 and it has also been stapled 3 times at that spot, it means they saw it and wanted to cover it up, now I have zero trust in them and when I think that the same people did everything for me, it makes me sick, I'll call the IHK maybe they can help me.