Defective water pipes in villa, which compensation

Good morning

No The circulation line would be from the WT to the storage tank with you.

You are now talking about the sizing of pipes to the [Zapfstellen]. The design is calculated using the total flow rate at peak flow. The pipe diameter does not need to be increased for every additional consumer. The circulation is not a consumer.

that is all completely clear to me. we are probably talking past each other. currently, the circulation line only serves the upper floor with shower + washbasin on top with line x. now, however, this line should no longer go directly back over the pump into the tank but should first run 10-15 meters through the ground floor with a branch to the kitchen and passing directly by the washbasin in the guest bathroom. part of the line (namely from the T-piece in the ground floor to the washbasin in the guest WC) is even one size smaller because the sanitary installer designed it only as a branch line during execution. the smaller cross-section should not matter since only the washbasin in the guest WC is connected as a consumer and the circulation pump as a low-demand consumer. it looks different, however, with the overall supply line. the line on the upper floor should accommodate 2 consumers, but now there are 4. of course, one would have to speculate when all 4 consumers are needed simultaneously and where the hot water would cut out first. nevertheless, it is an aspect that must be taken into account. as you already said, it will very likely work. overall, it is about whether it is really necessary to tear everything open in the hallway when the variant in the guest bathroom can be implemented much more easily and with fewer errors.

Just say right away that a circulation line is already present.

I would still proceed as mentioned. Usually, this should still work in a single-family house.
Alternatively, circulation control valves can also be installed.

Olli

hi

we completed our townhouse at the end of October and moved in.
....
then a new pipe will be laid so that the current pipe with the too long length will be integrated into the hot water circulation on the upper floor. ..

I mentioned it in the first post :) but it doesn’t matter. we'll see when the boss gets back to me now. He actually wanted to come by on Thursday or Friday, but knowing him he'll probably mess up my entire 2-week vacation. I'll just charge €200 per day. I already told him that I have time now and not just sometime later. The defect has been known for weeks, and I already know all his excuses.

so plumber was there. he offered me €750 as financial compensation. I laughed and said that we want the execution. then I told him my idea about the guest breakthrough, he was immediately enthusiastic. we are doing it that way now. he says 4 hours of plumbing work, then setting a tile new. so 1 day of work.