Electric bathroom heater vs. classic bathroom heater

Well, since I have been talking about radiators the whole time, it should be clear that it is not underfloor heating ;-)

Heating has little to do with social or not social. That is such a nonsensical old pseudo argument. The ground floor loses heat upwards. The intermediate apartments are heated most by the others. So who has to heat how for it to really be social? Certainly not everyone equally ;-)
Aside from the compulsion of district heating by the landlord, lack of obligation for photovoltaic systems, etc., the "social" aspect has no place here, as it is completely nonsensical. And blind heating does no favor to the environment either.

Towels dry when it is warm enough, the humidity is low enough, and the air exchange at the towel is good enough. If one or more parameters are no longer properly given in winter, then it becomes problematic or one or more parameters have to be artificially adjusted.

I have indeed given it some thought ;-)

Well, since I keep talking about radiators, it should be clear that it’s not underfloor heating ;-)

No, that’s exactly the problem if you had underfloor heating: room temperature stays constant, but no radiant heat for towels. Usually, a heater for towels is installed. That basically corresponds to your problem.

The same can happen with radiators that are not used even though you need them: you turn them down when the room is not in use, although the towels need the heat.
It’s quite clear here that you don’t use it.
So it would be silly to install a heater next to a working radiator.
Use your existing one and that’s it. If it is set to 3, two towels should dry on it. Maybe a rack on it helps so more towel volume can be dried (maybe you have 6 people in your household?... Answering questions often helps — especially for the OP — immensely)

Again: read properly. As already mentioned, the towels are not near the radiator. This is also not spatially feasible. Therefore, there is no even remotely direct heat transfer from the radiator to the towels. And we will not hang/change the towels on the heater every hour until all are dry. Unfortunately, the landlord did not think ahead and simply installed a long bathroom radiator on which the towels could have been hung.

That is why the idea is to remedy this oversight with a second one (the first one unfortunately cannot simply be replaced, as it is a rental apartment with district heating).

P.S.: Before the next futile attempt arises: it is also not possible to install a towel rail on/above/in front of the radiator, otherwise we would have done that a long time ago. Imagine it like this: rectangular room. Under the window on the short side a small radiator. On the long side at the opposite end of the room two towel rails. It should quickly become clear that this can never lead to optimal drying. So either a dedicated solution or a lot of "useless" heating at night.

If everyone has to go to the well for water and someone does not go to the well even though they could, but instead has water brought without compensation, then they are acting antisocially, regardless of whether some in the same building have to fetch more water or less. And in the environmental balance, this also makes no positive difference. On the contrary, heating through the neighboring apartment is less efficient than heating directly in the apartment.

Again: read correctly.

Yep! … without many words: Then I would give the advice to use common sense and look there for the source of the not dried towels. Apparently, you are the only one who cannot get the towels dry in a normal apartment with normal radiant heat because you refuse to heat your room to a normal temperature.

But feel free to correct me if I’m wrong! :)

I correct you: if you want to dry towels, you also have to heat. It does not matter whether you want to warm yourself in the room or not. To get moisture dry, you also have to sometimes turn on “high end”/power...
No arms, no cookies!

To me, your answers read as if you don’t want to find a solution!

I don't really understand the problem.

If we want to dry towels, we also hang them over a warm radiator. Certainly also in a room. If they are not dripping wet, they dry quite quickly.

And we won't hang/change the towels on the radiator every hour until they are all dry.

I now assume that the toilet is also located in the bathroom. At some point, you will have to use it, and then it’s no problem to simply swap the dry towel for the damp one.