If the Nest thermostat is on, but…

[Tpob]

Only one radiator is one in the house, will that stil be cheaper? I’ve heard Nest works to heat the whole house when on and Dan compensate on one off radiator with the on one? I hate the system and don’t understand it.

If the nest is in an unheated room and you set it to your usual living temp then the radiator which is on will be running almost all the time, is that the question you are asking?

I think the OP is asking if the radiator is only turned in 1 room instead of all the rooms, will it cost less than having the radiators on in all rooms