Fireplace Thermostat Sensor

Thermostatic Fan Control Accessory Switch

The Fireplace Temperature Sensor accessory switch easily plugs into your fireplace blower, automatically turning the blower on whenever the fireplace cabinet reaches 120°.

Here’s how it works; the magnetic fireplace temperature sensor attaches to the metal cabinet above the equipment compartment i.e.: the bottom of the actual firebox. When the metal where you have attached the sensor reaches 120° it will automatically turn on your blower. It will continue to run even after you turn the fireplace off, until the fireplace cools to below 120°. This allows you to continue to benefit from the heat produced by the fireplace for as much as 30 minutes after it has been turned off.

Buy a Fireplace Temperature Sensor accessory switch for automated control over your fireplace.


  1. With your fireplace off, cool, and blower unplugged; unplug the black wire from the blower and plug it onto the male lead from the fireplace thermostat. Plug the female lead from the thermostat onto the blower. The thermostat includes 24″ of wiring with male/ female type connectors that easily install on the blower. When purchased with the blower the wires come pre-installed.
  2. “Stick” the thermostat to the bottom of the fireplace about 6″ back from door. Make sure it is not on a label or near the pilot light.
  3. Make sure that the wires from the fan power supply and the thermostat are not touching the bottom of the fireplace (top of the equipment access compartment) as this part of the fireplace can get very hot and melt the wire.  Also, the glue that holds the magnet onto the temperature sensor is rated for 180°. This works fine for most gas fireplace installations, however if it is installed in a location that exceeds 180°, the glue will fail and the sensor will become dislodged from the magnet.  Make sure that the connectors from the back of the temperature sensor do not come in contact with the metal part of the fireplace.
  4. Plug the blower back in and turn on the fireplace. If the blower takes longer than 10 minutes to turn on, re position the fireplace thermostat sensor to a place on the bottom of the firebox that gets warmer faster.  All fireplaces, burners, and log assemblies are different and all fireplaces have hot and cool spots. Move the sensor around until you find the spot that turns the blower on fairly quickly. Note that some vent free fireplaces are built in a way that prevents this part of the cabinet from warming up to the required 120°. If you are unsure about your fireplace, you should turn your fireplace on & see if the cabinet gets hot to the touch.
  5. The magnet should be installed horizontally as shown in the picture below. The magnet is designed to hold it in place in this configuration. If installed vertically “up the side of the firebox,” the sensor will eventually “fall off.” With the sensor away from the cabinet, the blower will stay in the off position.

Buy a Fireplace Blower today and feel the difference.