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Changing a Manual Valve for a Thermostatic Radiator Valve

Updated: 2 days ago

A homeowner using an adjustable wrench to remove a radiator valve from their radiator

It is relatively straightforward for a professional to swap a manual valve for a TRV and it is recommended that all radiators in the house are upgraded at the same time. This should be completed by a professional as it is important that the inhibitor in the system is properly checked and topped up if necessary. The system will also need to be rebalanced to ensure optimum performance.

A simplified version of the process is as follows:

  1. Drain the heating system. As the valves have to be removed fully, they cannot be used to isolate the radiator in question.

  2. Once the system is empty, the nuts and compression fitting that connect the valve to the radiator and system pipework can then be loosened and the valve removed from the pipe.

  3. Remove the existing valve insert from the radiator connection. The new TRV will be supplied with an insert that is fully compatible with the new valve. This can be done with a hex tool and spanner.

  4. The new valve insert can then be fitted in its place.

  5. Push the new valve housing onto the pipework and tighten the fitting. Repeat with the connection to the radiator

  6. Fit the TRV head unit onto the valve body and adjust it to the required setting.

  7. Repeat the process with the lockshield valve.

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British Thermal Units (BTU) is a measure of the output of heat needed to raise the temperature of a room. Determining the correct BTU will help you get the right radiator for your home.

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