Warm / not cold floor - underfloor heating?

Just do a comparison calculation. Which radiators should/must be replaced? Completely leaving out a radiator in a room is, to put it mildly, nonsense. Because the room MUST be heated somehow. Even if it is in the most inefficient way. Namely through the neighboring rooms. Fireplace or not, is it used? And if so, with what kind of wood. If you have to buy wood, you don't save anything at all. And you have work and mess. Is the central heating also being replaced? What else do you want to do to the house?

A nice, not cold floor is vinyl. We have installed click vinyl in the hallway, dining room, kitchen, and more rooms will follow. It doesn’t feel as cold as tiles. You can nicely walk on it with socks. To what extent you walk barefoot on it also depends on the ambient temperature.

If you do choose underfloor heating: a traditional radiator is still recommended because you can’t quickly heat up the room with underfloor heating. In the dining room, we also have underfloor heating plus a traditional radiator.

Mixing systems should, on the contrary, be strictly avoided. They operate with different flow temperatures, which makes the whole thing unnecessarily complicated. In practice, it is also not necessary at all to quickly heat up a room. Why bother? You simply keep it at a constant temperature.

Runs with the same flow temperature for us. There is a controller in front of the underfloor heating that limits the flow rate and thus keeps the temperature under control. That was recommended to us when retrofitting.

If you are not at home all day, a constant temperature X is sufficient for me, but in the evening or with spontaneous visitors it might seem too low. Then the heating.

In an old building, flow temperature may be sensible. In a modern house, it takes days for the temperature to decrease, so the temperature is not varied but always kept the same.