ᐅ Underfloor heating and radiators – two thermostats in one room

Hello everyone,

I have a single-family house built in 2019. There is underfloor heating everywhere except in the bathrooms, where it is supplemented by radiators. Otherwise, the heating surface would not be sufficient, I was told. This way, the rooms get as warm as I want. But now I have two thermostats: one electric thermostat for the underfloor heating and one mechanical thermostat on the radiator.

Now my questions:
1.) What is the best way to regulate the heat? Should I set the radiator to 5 and then control the temperature via the room thermostat? Or the other way around? I am not entirely clear about how the two work together.

2.) Thinking one step further: Could I use the room thermostat and underfloor heating to maintain a base temperature, and then have the radiator provide additional heating as needed? Possibly with a timer control.

Thank you in advance.

Enrico

Is the radiator electric or connected to the heating circuit?

It is part of the heating circuit.
By the way, it is an air-to-water heat pump.

Such radiators are unfortunately quite inefficient. Radiators require a much higher supply temperature than underfloor heating. At the moment, I don’t have any ideas about which setting would be most suitable. Have you tried turning the radiator completely off? Does it actually get colder because of that? Otherwise, frequently adjusting the heating system is generally not good for the heating circuit.

The radiator is definitely needed. In the bathroom, I would like it to be around 22-23°C (72-73°F) in the morning at least, and the underfloor heating alone wasn’t able to achieve that.
We don’t need to discuss here that underfloor heating is not suitable for night setback and similar functions; I just wanted to understand the logic behind having two thermostats. And precisely because it’s best to let the heating system regulate everything, my approach so far has been to keep the radiator thermostat always set to 5 and then adjust the desired temperature using the room thermostat.

I find it interesting that you notice a difference through the radiator. As far as I know, these things usually only get lukewarm and therefore don’t really provide additional heating.