Heating circuits/thermostats for living/dining/kitchen with underfloor heating/heat pump

No, that is not sufficient. It is also defined how they are supposed to function.

From the posts I found through the search, I took away the following: - there are regulations to comply with - if you do not comply with regulations, a penalty threatens - if you take advantage of subsidies, they can be reclaimed - you can have an individual room control system installed and then basically not use it if you don't need it (that seems to me a viable way) - you can be exempted, which in my specific case (simplified building notification procedure = only 1 attempt) I would have to discuss at least with the building authority

or you just do it, but you're not allowed to say that...

I somehow assumed that individual room control is common nowadays. We are building with a ground source heat pump. Is that fundamentally pointless or only under certain conditions? I can't achieve a temperature difference of 5-6°C between different rooms just by the design of the underfloor heating (narrower or wider loops), can I?

Yes, common, because mathematically there is about 3% savings in heating energy. And politics only looks at these figures.

What does that mean (very roughly estimated) – in a modern house, you have about 30 euros more at the end of the year.

That thermostats are needed in every room for the individual room control + an additional control for these + meters of cables and extra slots, which have to be installed and closed again by the electrician... and behind that also the consumption of electrical energy of about 2W per thermostat actuator in operation are of little interest to most people...

But if you put it all against each other, the savings are in the per mille range...

Oh, and of course any apprentice in their second year can install an individual room control system, because if the heating circuits are not coordinated and there are hydraulic errors etc., the room controls just regulate that away and then everything works...

Without individual room control, you have to use your brain and design and install the system according to the house... and who wants to do that?

Just slap the parts on the wall... and then everything is super...

I definitely use our ERR! There are various phases of life in which it can very well happen that individual rooms are set higher or lower. One should absolutely not adjust the HK regulator, otherwise the entire calculation is no longer correct,... Children's room: Turn it up in the morning - turn it down at noon - windows open in the evening. In winter, I want about 21 degrees there during the day and 18 degrees at night,... It's annoying if I don't have a regulator. When visitors come (parties and so on), I turn the heating in the living room completely down, since the people are overheating the room anyway, so I don't need the heating on top. Now the statement comes again: Don’t touch the ERR at all, that would only burden the heat pump more,... I am glad to be able to control individual rooms differently and for me it makes more than just 1 / 2 degrees difference,...

Children's room: Turn it up in the morning - turn it down at noon - open the windows in the evening. In winter, I want it to be around 21 degrees during the day and 18 degrees at night,... Annoying when I don't have a controller.

What a fuss, that you turn it up in the morning so that it's warm at noon and then turn it down immediately so that it gets cooler in the evening. Do your children actually always close the doors so that it works? In our case, the entire house (only partly the bathroom doors or the door to the parents' area are closed) is basically an open space during the day, so I can fiddle with the controllers however I want, but it doesn't make any difference room by room. How well insulated is your house that you can still achieve such high temperature differences?