TGA planner difficulties, underfloor heating supply temperature + wastewater ventilation

and the effort might not be proportional to the savings under certain circumstances. As I said, the bathroom is already at its limit. So it now needs wall heating or electric supplementary heating, which again means disproportionate effort. Here too, the Pareto principle should be applied.

I don't know how you can already estimate effort/benefit? Do you know figures on additional costs and future energy prices. Especially since ancillary costs are currently becoming more and more expensive, I also don't quite understand what a few meters more pipe and possibly a [WH] are supposed to make so expensive.....knock off plaster, lay [WH], replaster, done... you have to be pragmatic sometimes. Alternatively, install a chicken ladder electrically.

I can only advise everyone to pay explicit attention to this, once the screed is in, it is too late.

As I said, the bathroom is already at its limit.

I don’t know how you currently use your new buildings. But I generally know it more or less like this: all doors in the house are open. And then it’s always around 22 degrees in all rooms. So I don’t see any real problems with the bathroom.

So in the bathroom we mostly already have the door closed, the bedroom actually too. Otherwise, of course, you are right, it will all even out.

According to calculations, the heating should be installed with vinyl as the floor covering and 36° flow temperature on the ground floor with a distance of 20cm and on the upper floor with 10/15cm, main bathroom with 5cm and guest bathroom with 10cm.

We are now installing on the ground floor with 15cm (so a bit closer) and on the upper floor with 10cm (also a bit closer). All bathrooms with 5cm, so there's no way to change anything without wall heating. Electric bathroom radiators add a bit extra but are not considered in the calculation.

Therefore, I would say from a gut feeling that the flow temperature in the real environment should be a bit lower, whereas the temperature in the living room will probably be more around 21/22° than the designed 20°. I think the distances are reasonably fitting for the bathrooms. With 5cm pipe spacing in the living/dining room we don't really gain anything either.

I also don't quite understand what makes a few meters of pipe and possibly a WH so expensive..... knocking off plaster, installing WH, re-plastering, done... sometimes you just have to be pragmatic.

Right, the effort plus the effort for the planner, who surely charges around 200€ per hour and maybe estimates 5 hours for such additional planning. The general contractor also charges higher hourly rates because it deviates from the original scope, plus 25% margin from the developer and 19% VAT ... that really adds up.

Right, the effort plus the effort for the planner, who certainly charges around 200€ per hour

The planning including the installation plan costs about 150€ at the external engineering office. But not per hour, rather as a flat rate. So as an effort in house construction, it is negligible.

I am aware of that and would have liked to do it that way as well. However, since I do not have any meaningful documents that I can give to the external office, it is unfortunately of no use to me.