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Thermostatic Radiator Valves

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Tips on installing TRVs on one-pipe steam radiators and setup advice for all systems

Using thermostatic valves

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.

Satin Nickel thermostatic valve head.

Removing the radiator for maintenance or decorating

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.

One-pipe steam installation

White cast iron radiator in open plan kitchen diner.

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.

  1. Position - The TRV should be about a third or half of the way up the radiator. If you have ordered a new radiator from us, we will have tapped a hole in the casting for the TRV installation.
  2. Steam vent - For the TRV to function properly a steam vent is required. It will be in the box along with the TRV and should be inserted into the 1/8" NPT female boss on the valve, and is designed for a straight shank.
  3. Valve orientation - the valve is designed so that the controls are mounted horizontally and the steam vent is vertical. This allows it to function most efficiently and ensures the valve controls are easily accessible.