Hot water or electronic towel radiator?

Since I have underfloor heating, the radiator is not connected to the water circuit.

If the heating coils are laid tightly together, that should be sufficient. Our bathroom does without additional heating but also has a relatively large floor area since it is under a sloping roof. There are no longer any night setbacks.
I have heard that an infrared heater is supposed to be suitable as a localized and temporary supplemental heating.
Regards, Yvonne

Everything that is used electrically as a direct device behaves in an energy-inefficient manner.

Everything that is used electrically as a direct device behaves in an energy-unfriendly way.

Of course, but it doesn't matter if it is only operated for 10 minutes every three days. The eco variants are then too expensive. Karsten

The correct solution is: to install an additional wall heater. If "warm" towels are desired, then simply a towel rack is mounted on the wall. A water-based towel radiator can cause problems with the overall hydraulics (hydraulic balancing), too high flow temperatures, and possibly sludge buildup. An electric one simply consumes electricity directly. Night setback is nowadays absolute nonsense. Heating runs 24/7 with a very low flow temperature. It doesn't cost a cent more and leads to greater comfort. That way, even elderly people can go to the bathroom at 3 a.m. without freezing. Or change a baby.

Three o'clock in the night in the toilet? Granufink prevents that.