ᐅ Wall thermostat with rotary dial from Busch-Jaeger

That’s exactly what I mean: if I set the Unitower to 19°C (66°F) and turn a thermostat to level 4 or 5, it can never reach that temperature, so the valve never closes and the power keeps running indefinitely because the heating remains active?

Well, since no energy is actually entering the house, you’re not really consuming anything. Only the maximum of 20 euros per year for the radiator valve actuators at the heating manifold, and if the heating runs continuously, you just pay around 15 euros for the electricity for the valves. So it’s not that significant.

You have a small misconception.

You think you can control something with the thermostats in the rooms. That’s not the case; they are more like wall decorations and emergency stops, provided that the heating system is properly sized and optimally adjusted.

Can’t I just control each room individually using the thermostats? Apparently, I really have a misunderstanding. I thought that if I set the thermostat to 4 in the dining room, I would get about 20°C (68°F). And in the bedrooms, I would just set it to 2 or 3 to reach around 15 or 16°C (59 or 61°F). Isn’t that how it works?

But that happens because the thermostats then apparently stop the heat output. However, this is not a form of regulation but rather a throttling of the system.

But what exactly are you trying to get at?

I want to know how I can set the temperature via the thermostats so that I have different temperatures in the various rooms. Bedrooms should naturally be cooler than the bathroom and living areas...

You grab one or more thermometers and first set the heating system.

Turn all the knobs to 6, then check the temperatures in the rooms after 2-3 days.

Then adjust the heating down or up so that the bathroom still reaches the usual 24°C (75°F) when set to 6.