He said: “The numbers actually relate to the temperature in the room, not the temperature of the radiator.” This means the thermostat valve works to track the temperature of the room rather than regulating how hot the radiator itself gets.
Plumber explains what every number on your radiator dial means If you take a closer look at the radiators in your home, you’ll notice a small knob with numbers on it, known as a thermostatic radiator valve (TRV).
A TRV detects the room’s temperature and controls the flow of hot water into the radiator.
On the other hand, when the room reaches the desired temperature, it reduces the amount of hot water flowing into the radiator.
In an another interview with the Sun, Nathan also mentioned: "TRVs are a simple way to give you full temperature control on radiators in any rooms where you have the TRVs installed.
