Control floor heating

Hopefully you are not expecting miracles when it comes to different room temperatures. A modern house is so well insulated that the heat (hopefully) stays inside. On the other hand, an interior door is mainly for privacy; its insulating properties are very limited, and the same often applies to interior walls.

Under these circumstances, how do you want to achieve a "non"-warming of unheated rooms? What is achieved with this is heating the building volume through a smaller heat exchanger surface (underfloor heating); for this, the supply temperature must be higher, which leads to higher energy costs.

Temperature differences of 2-3 degrees are possible in a new house according to my experience so far, provided the doors are kept closed.

That is also why it is often recommended to forgo individual room control; underfloor heating is too slow for quick changes anyway, and slight temperature differences are controlled by the flow rate.

That is why it is often recommended to do without individual room control,

...And in my opinion this violates the Energy Saving Ordinance and consequently the conditions of the KFW.

Better to just install the cheapest thermostats and only remember two positions: On and Off.

Toxi, sure? Body writes, for example, "Due to the 'self-regulating effect' of surface heating systems with low system and surface temperatures, the energy saving ordinance can be considered fulfilled if a central outdoor temperature-controlled regulation with a timer is present."

In addition, it is possible to be exempted from the obligation to install an individual room control.

*Bosy natural

According to Par. 14 of the Energy Saving Ordinance, all central heating systems must in any case be controlled by outside temperature and time.

However, I do not deduce any exception for underfloor heating, unless it concerns rooms smaller than 6 sqm. Individual room control must be possible.