How do I Replace a Radiator Thermostat?

Written by c.l. rease | 13/05/2017
How do I Replace a Radiator Thermostat?
Thermostats control the flow of steam through a radiator system. (white radiator image by Ekaterina Sidorenko from

Radiator heating systems use steam transferred through piping to heat your home. A thermostat attached to the radiator controls the flow of steam within the heating system. You can increase the heat within a room by installing a lower temperature thermostat. This allows the thermostat to open earlier increasing the amount of time the radiator produces heat. The opposite holds true if you need to reduce the amount of heat in a specific room.

Turn off the thermostat controlling the room's radiant heat system. Allow the radiator system to cool to room temperature.

Turn the valve located at the bottom of the radiator clockwise to close the shut-off valve.

Twist the air vent counterclockwise to remove it from the radiator.

Remove the steam valve (thermostat) from the radiator with an adjustable wrench (if applicable.)

Wrap the threads of the replacement steam valve with pipe sealant tape. Thread the steam valve into the radiator. Tighten the valve with an adjustable wrench.

Align the air vent with the threads of the steam valve. Turn the air vent clockwise to thread it onto the end of the valve.

Turn the shut-off valve counterclockwise. Turn on the thermostat to start up the radiant heating system.

Things you need

  • Adjustable wrench
  • Pipe sealant tape

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