Thermostatic radiator valves (TRVs) are designed to keep the temperature in a given room constant because the valve itself act as a thermostat. Accordingly, it doesn’t matter if you have ten radiators in a room or just one puny little one, if you set the valve(s) at the temperature you want for the particular room then you must leave them alone to do their job.
Fiddling with them, constantly turning them up and down, is totally to defeat their purpose.
If your room is too warm (or cold) then tweak the valve(s) on the radiator(s) in THAT room down (or up) a tiny bit and see if you like the room temperature better. Continue in this way until the room is exactly the temperature you like it then LEAVE THE VALVES WELL ALONE.
If it goes colder outside there should be no need to touch the valve because it will be still trying the get the room to how you like it (by opening and letting hot water flow into the radiator).
In a heatwave or maybe when lots of people in the room are adding their body heat there should be no need to touch the valve either because it will be still trying the get the room to how you like it (and will have closed before you touch it).
As a general rule a setting of 3 is average. So maybe go up to 3.5 or 4 in a lounge if you like a warm room or set maybe just 2 for bedrooms which are generally preferred to be cooler.
Using thermostatic radiator valves (TRVs)
Posted by Handy on October 1, 2013
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