A room thermostat reads the air around it, so where it sits matters. On an inside wall about 1.5 metres up, away from radiators, sunny windows, draughts and the kitchen, it gets a fair reading of the house. At that height it is easy to read and reach.
Thermostatic radiator valves should not go on the radiator in the same room as the main thermostat. If they do, the two controls work against each other and the boiler can keep running. Leaving the valve off that one radiator lets the room thermostat do its job.
When a boiler is replaced, Building Regulations guidance asks for thermostatic controls in each heated room, usually TRVs or room thermostats. Jaque checks what the house has and adds what is missing.
Many smart thermostats talk to the boiler through a small receiver wired in near it. Jaque checks the Wi-Fi signal where the thermostat will sit before he fixes anything to the wall.
If you have a hot water cylinder, the hot water usually has its own timer and a cylinder thermostat, separate from the heating. That way the water heats when you need it, not every time the radiators come on.
