Electric bathroom heater vs. classic bathroom heater

Sorry, but this is so terrible to read After showering, ventilate sufficiently, close the bathroom, and then you can also set the bathroom heater to level 3, and the towels will dry.

You can of course find it terrible, but this is about something else, namely what is more efficient. If I close the door after airing and set the heating to 20 °C, I still have a fairly high humidity and just heat for 8 hours for a few towels. By contrast, with a dedicated towel dryer (regardless of operating mode), I would dry for a maximum of 1 hour and then or even while doing so keep the door open. This significantly reduces the humidity and could be more energy-efficient because the target object (the towels) is heated directly and not an entire room, whose air then has to provide the drying. Do you understand what I mean? It's also about how to dry towels most efficiently. It is not about whether a bathroom should always be kept toasty warm.

But the temperature is often enough for mold. It doesn’t appear immediately, but very slowly and imperceptibly..

No signs of mold for 3 years. The bathroom is also relatively small, so the moisture quickly spreads throughout the apartment when the door is open. Since all doors in the entire apartment are always open, this results in a very slight increase in humidity and so far no signs of mold.

How about a programmable thermostat for the existing radiator? Then you could heat up a bit before and after using the bathroom. I don’t think buying an extra radiator is worthwhile. Neither for your wallet nor for the environment.

How about a programmable thermostat for the existing radiator?
Then you could heat up a bit before and after using the bathroom.
I don’t think buying an extra radiator is worthwhile. Neither for the wallet nor for the environment.

That was also a consideration (I’m retrofitting BLE thermostats everywhere anyway for control via Home Assistant), but due to the position of the radiator and the towels, you really have to heat well with the door closed. This makes the humidity really high. With the door open, the humidity would be much lower, but drying would only really be possible with a dedicated radiator.

P.S.: Regarding the environmental aspect, I was thinking anyway that I would never build without photovoltaics, so then every electrical solution becomes interesting again and the radiator would be reused in a private home. I don’t want a disposable solution, as far as possible.

Heating so little may seem economical at first, but in an apartment it ultimately is not. Your neighbors are heating for you. Ultimately, such behavior is actually not very social. I can't calculate it, but someone else here has calculated that just 1 hour daily with electric HTHK increases consumption by about 20% or so. Continuously heating to 20° would probably even be cheaper?

Was it even mentioned whether it is a new or old building? How is the apartment heated? Radiators or underfloor heating? ... The situation is not entirely clear! How big is the bathroom? If it is, for example, underfloor heating, then the usage (18:00-06:30) plays too small a role, since there is a base temperature. Then the question is how much "towel mass" is involved, for two or four people?! Our shower towel, for example, dries even over the shower tray or a chair...

Wouldn't the towels dry normally if it were really dry enough and warm enough in the bathroom?