ᐅ Has the heating pipe been bent too sharply?

It really looks chaotic – the spacing between the pipes is completely uneven. The bend is not only unnecessary, but really excessive.

Oxygen diffuses into the system through the pipes and gradually corrodes all the steel components – this leads to sludge buildup. A professional company hasn’t installed something like this for a long time.

Ouch, the new picture is really tough to see...

According to the tender, apparently PE-Xa 5-layer pipes are to be used instead of PE-RT. I still need to check what is actually installed in the house, as normally this information is printed on the pipe.

Regarding the kink issue, they want to cut out the affected section and insert a new piece with couplings. I politely declined this, as I do not want to see anything like couplings in a new construction. They should completely replace the entire loop.

Couplings are not an issue when installed properly and isolated from the screed.

I have nine of them myself – completely fine.

PS: By the way, the correct oxygen barrier pipe is used.

Hmm, I wouldn’t say it’s exactly the right one. According to the specifications, it should be a PE-Xa pipe, but in fact, a PE-RT pipe was installed, which is somewhat cheaper than the XA variant.

That's right, but it's an RT pipe, and it says it's oxygen-tight – I was only familiar with XA pipes and aluminum composite ones as being airtight.

Well, you'll have to clarify that yourself.