Underfloor heating + radiator -> two thermostats in one room

Hello everyone

I have a single-family house from 2019. Everywhere only underfloor heating, except in the bathrooms, where it is supported by radiators.
Otherwise, the heating surface would not be sufficient, it was said.
At least this way it gets as warm as I want it to. But now I have two thermostats, one electric for the underfloor heating and the mechanical one on the radiator.
Now my questions:
1.) How should I best regulate the heat? Radiator at 5 and then via the room controller? Or the other way around?
The interaction of the two is not quite clear to me yet.

2.) And thinking one step further: Could I establish a base temperature via the room controller and underfloor heating and then have the radiator assist as needed? With a timer.

Thank you very much in advance.

Enrico

Is the radiator electric or connected to the heating circuit?

It belongs to the heating circuit. By the way, it is an [LW Wärmepumpe].

Such radiators are unfortunately quite inefficient. Radiators require a much higher supply temperature than underfloor heating. Unfortunately, I currently have no idea which setting would be most suitable. Have you tried turning the radiator off completely? Does it even get colder as a result? Otherwise, constantly adjusting does not generally do the heating circuit any good.

The radiator is definitely needed. In the bathroom, I would like it to be 22-23 degrees (at least in the morning), and the underfloor heating alone couldn't achieve that. We don't need to discuss here that underfloor heating is not suitable for night setback and similar things; I just wanted to understand the logic behind the two thermostats. And precisely because it is best to let the heating control everything, my approach so far has been to always leave the radiator thermostat at 5 and then find the right temperature via the room controller.

I find it interesting that you notice a difference through the radiator. I know it as the things getting lukewarm and accordingly not heating up.