Many thanks for the answer. What we would like that we can control each room separately. I think the cheapest and most efficient solution would be to control a smart thermostat like Bosch (no display) for each of the rooms. We tried one and it seems to work the way we need it to. The only question is whether Vitacal can be connected to smart home one way or another. So that the temperature on the thermostat cannot exceed the temperature on the heater.
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