How to turn a radiator off

How to turn a radiator off

The ability to turn off a radiator is an important piece of DIY knowledge for any householder with a central heating system, as you never know when you might be required to do it.

There could be several reasons for turning off a radiator in your home, such as:

  • Temperature control: If a room or area of your home is already warm enough, you might want to turn off the radiator in that area to avoid overheating.
  • Energy efficiency: Turning off radiators in rooms that are not frequently used can help you save energy and reduce your utility bills.
  • Maintenance or repairs: If a radiator is leaking or needs to be repaired due to not getting hot properly, it might be necessary to turn it off to avoid further damage or safety hazards.
  • Ventilation: Turning off radiators in rooms that require proper ventilation, such as a bathroom, can help to prevent mold growth and moisture buildup.
  • Aesthetic reasons - You might want to decorate behind the radiator, in which case you'll need to ensure it's off and cold.

The different ways of turning off a radiator

Turning off a manual radiator valve

Locate the manual valve on the radiator. This is typically located on the side or bottom of the radiator and should have a knob or lever that you can turn.
Turn the manual valve clockwise until it stops. This will shut off the flow of hot water into the radiator.

If the valve is difficult to turn or you feel resistance, don't force it as it may be damaged or stuck. Instead, try to identify and fix the issue before attempting to turn the valve off again.

If you're turning off the valve to make repairs or maintenance, wait for the radiator to cool down before attempting any work. Hot water can cause burns and scalding, so it's important to take caution when working with radiators.

To turn the radiator back on, turn the manual valve counterclockwise until it is fully open. This will allow hot water to flow into the radiator again.

Turning off a thermostatic radiator valve

Locate the TRV on the radiator. This is usually located on the top or side of the radiator and should have a numbered dial or a lever that you can turn.
Turn the TRV dial or lever to the lowest setting, which is usually marked with a snowflake or a number "0". This will reduce the flow of hot water into the radiator, eventually stopping the flow completely.

Wait for the radiator to cool down before attempting any work. Hot water can cause burns and scalding, so it's important to take caution when working with radiators.

If you're turning off the TRV to make repairs or maintenance, you can also turn off the lockshield valve located on the other end of the radiator. The lockshield valve controls the flow of water through the radiator and can be adjusted with a spanner. Turn the valve clockwise to shut it off, and counterclockwise to open it.

To turn the radiator back on, turn the TRV dial or lever to the desired setting. This will allow hot water to flow into the radiator again.

Turning off a radiator with a broken thermostatic valve

If your TRV is stuck in the open position, there will be no regulation of the water flowing into your radiator. You won't be able to twist the TRV into the off position (of if you do it won't make a difference) and your room will probably feel overly hot. Often when a TRV brekas, you'll need to replace the whole valve to get things working again.

However, in order to simply turn the radiator off in the meantime, all you need to do is go to the lockshield valve on the other side of the radiator. Remove the white cap and take a small spanner or flathead screwdriver and trurn the valve clockwise until you can't turn it any more. This will close the valve and stop the water flow. Try and make note of how many turns you gave the valve in order to close it and then do he smae amount when you come to open the valve again. This will ensure the radiator keeps balanced and doesn't upset the balance of your heating system.

How to change a thermostatic radiator valve


Seek professional help

If you get absolutely desperate and just need your radiator off, you could always switch off your boiler which would switch off your heating across your entire house. However, there is clearly a problem that needs exploring more deeply if the above suggestions don't solve the problem.

If you're unable to turn off your radiator, it's best to call in a professional heating engineer or plumber. Attempting to force the valve or make repairs yourself can be dangerous and cause further damage to your heating system, especially if you're not sure of what you're doing. You don't want your efforts leading to costly repairs, water damage or other calamity.

How to get the right heat for your room

The best way to ensure you don't underheat or overheat a room is to use a heating calculator to ensure you get the right-sized radiator.

A heating calculator for radiators is a tool that helps you determine the heat output required to effectively heat a room or space. It takes into account the room's dimensions, the number and size of windows, the insulation levels, and other factors to calculate the optimal size and number of radiators needed to maintain a comfortable temperature.

By using a heating calculator, you can ensure that your heating system is sized correctly and operating efficiently, which can help save energy and reduce heating costs.

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