Sanitary shell inspection: What should we pay attention to?

Thank you! Could you also take a look at the attached plans? Are they okay from a planning standpoint? Did I understand correctly that, for example, in the living room, three heating circuits of 84.43m each, totaling 253.29m of hose, will be installed?

Are they okay in terms of planning?

These are initially only calculations. There seems to be an error in the heating output in the bathroom. Regarding the pipe length, it is not 36 watts. Please inquire about this.

Did I understand correctly that, for example, in the living room three heating circuits of 84.43m each, so in total 253.29m of pipe, are laid?

Exactly. For one square meter of living space you need about 9-10m of pipe. So 25sqm is roughly 230-250m.

All right, thanks! :)

These are initially just calculations. There seems to be an error in the heating capacity in the bathroom. For the pipe length, it is not 36 watts. You should ask about this.

Could you briefly explain the error to me? Should the pipe length be longer for 36 watts?

Can you estimate, based on the rooms and circumstances ("normal" single-family house, photovoltaic system with 10.3 kWp on the roof), how much the heating saves annually given the current electricity prices if it runs at 28°C instead of 35°C? How much does the lifespan increase?

The thing is, we would basically like to do it. However, we did not plan for the 4,000 euros like that.

Could you briefly explain the error to me? Should there be a longer pipe length for 36 watts?

36 watts are 5 tealights ;). That won't get warm. For the pipe length, it should actually be around 300 watts.

Unfortunately, I don't have a rule of thumb for the energy savings. I estimate about 10-15% less heating costs. You can roughly calculate yourself whether it’s worth it for you.

Sorry, only now got around to writing something. So as it is currently calculated, I would not commission it. Unfortunately, it would not help because all circuits would have to be significantly reduced in order to get the bathroom warm. I am not so sure if it is a calculation error. It could simply be due to the low delta T of 4 degrees and the wide laying distance of 10cm for a bathroom. First of all, the question is what requests you have made? So did you request the entered room temperatures? Do the throughput values correspond to the actual floor coverings? In part, that does not really meet my expectations. Are you getting an (electric) additional heater in the bathroom?

The good news is, you get a heater that you really have to be quite rough with for it to use a lot of electricity ;)

As mentioned elsewhere, I reached about 2000 kWh in one year including hot water.
With this setup:
https://www.hausbau-forum.de/threads/spontane-verbesserungen-an-auslegung-fbh.37707/

I'm also not sure if the closer spacing really benefits you that much, since even I in the deepest winter am far from the heater running continuously.

On the other hand, if money doesn’t hurt, I would always use it for something that can’t be changed later.

Alternatively, you could arrange something with the trade on site. I persuaded them to lay additional loops under the bathtub.
It didn’t help much though, the bathroom is still the coldest room on the upper floor. But that’s what quick heaters are for ;)