Thermostatic valves can give substantial energy savings but they take a little setting up to get the comfort right.
With the heating on, set the thermostatic valve to halfway. Leave this setting for at least an hour. If it feels a little cool, increase the temperature setting by turning the handle anticlockwise half a turn. Likewise, if too warm, reduce the temperature setting by turning the handle clockwise half a turn. Continue in this way until the room is at the desired temperature, leaving at least an hour between each change.
Thermostatic radiator valves are designed to let a small amount of water pass through at certain temperatures even when fully closed. All Castrads thermostatic radiator valves come with a decorator’s cap that can fully close the valve. This should always be used if removing the radiator from the system to prevent leakage during the works.
A steam TRV on a One-pipe steam system allows for a much greater degree of control on the heat output of your radiator. There are a few key things to look out for when installing to ensure it works to it's best abilities.