Lowering the supply temperature in underfloor heating more complex than expected?

The fan heater (1800W) is included with us - whether it is stylish, I don't know yet ;).
An electric (towel) radiator doesn't make energetic sense, does it?

I couldn't imagine using a fan heater at all.

We have installed electric radiators additionally so that the towels don't stay damp.

No, energetically that is complete nonsense. But it is simply the easiest solution if you want to get the bathrooms warm with a low flow temperature. The electrician installs an outlet and the plumber mounts the radiator. Done. Not much to coordinate, unlike with a wall heating system. We decided against it. You don’t stay in the bathroom forever anyway. We don’t have problems with damp towels; we installed one towel rail per adult and everything dries quickly on them.

And what do you think about an infrared wall or ceiling panel instead of a towel radiator? Of course, you can't hang towels on it, but it is supposed to be more energy efficient.

then I would take an infrared mirror

Energetically, it does not matter at first whether it comes from a fan, radiator, or panel. They all produce one kWh of electricity and one kWh of heat. An advantage can be that it can be directed more towards the user in places where you are more likely to feel cold. For example, at the exit of the shower. For us, the important thing was to be able to dry the towels.