Is a towel radiator mandatory?

Then it also depends on the comfort temperature, which for us is about 24 degrees in the living room

I have 30 degrees flow temperature at something around minus 25. However, it has never been that cold before, no idea if I still have to raise the heating curve. I have 25 degrees flow at about minus 5 degrees. So without the heating cartridge, the thing would be pretty useless there. But in the living room, 21 to 22 degrees is enough for us, otherwise I would have to take off my T-shirt as well. But 2 degrees more would only increase the flow temperature by about 2 degrees anyway. For me, cozy warm towels would only be really right around 38 to 40 degrees.

No, let's leave it, I don't think anyone wants to see that *lol* Then your energy demand must be very, very low, I suppose. For the living room, I could probably lower the flow temperature by 1, maybe 2 degrees at the same temperature of 24 degrees, but then we wouldn't even come close to 24 in the bathroom...