Protocols for sample heating - Which form to use?

The parquet fitter says the form must strictly comply with the requirements of DIN 18356.

Correct. And it does say that you have to heat up to the maximum flow temperature, right? The maximum would probably not even be 40°C, let alone 50 or even 60°C.

That's right. What follows from that? The expert doesn't even know why he specifies this temperature. He just always does it that way. More doesn't hurt, though. It costs energy and time.

Asking GU is pointless, he said that is unnecessary and if we want that, the construction time will be extended at our own responsibility,

The more I read about your developer, the more I find him a "K..TZEN". I hope you will report on him after the completion of the construction project with company name and location in the subforum "Experiences with house-building companies."

In our case, the heating engineer carried out the heating program. However, the floor installer wants even more moisture to be removed from the screed before starting, so we are continuing to dry beyond the heating program.... Until the measurement value falls below 0.3 CM-%.

I just remembered, when commissioning heating starts soon, it might be time to sign a gas supply contract. But I don't even have a meter yet. I need to talk to the GU about when I can register it. That probably needs some lead time. And in a week from tomorrow the screed will be laid.