Millivolt thermostats operate at low voltage, usually around 500 millivolts. Because it’s low voltage, it does not have a step-down transformer or is not linked to the wiring system in your home. As with other low voltage devices, it is equipped with various features, including adjustable settings, digital displays, and wireless remotes, touchscreens, and much more.There are a variety of thermostats you can add to the gas fireplace. But it is the Nest thermostat is the most well-known one to use in this scenario. In order to add it to your fireplace, you’ll follow the steps below:

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1. The gas fireplace you have is not compatible with 24v AC. Therefore, you must make use of an adapter.
2. You’ll need a relay to switch the fan in your fireplace. When the Nest will switch to the 24v power source, this relay will change the millivolt system of your gas fireplace.
3. You must unplug the thermostat’s wires to the gas fireplace, and then install an AC adapter. Then, connect one wire of your AC adapter with it through the Nest backplate’s RH connector. Once more, connect the other wire from the AC adapter to the current thermostat wire(Red). The thermostat should be connected by connecting the wire(White) on W1 of the Nest to the backplate’s wire W1.
4. Install the relay close to or in the fireplace’s gas line. It might be helpful to keep some female spade connectors available for this process in case you don’t already have these. Connect them all the Wires which include 2 wires coming from Nest and two wires from the fireplace. The wires coming from the Nest thermostat must connect to the terminals of 1 and 3 of the relay. The relay should be connected via terminals 2 and 4. of this relay and connect them to the thermostat, which connects to the fireplace.

1. The AC adapter must be connected to. For use with to use your Nest thermostat, just join it with the backplate. If everything is working your fireplace’s gas line should be operating with the fully functioning Nest thermostat. After you have charged the battery inside the Nest fully, you’ll be able configure the WiFi settings as well as control the thermostat through the app.