Is there a millivolt thermostat?

Millivolt systems are regulated using thermostats specifically designed for the system, commonly known as ‘millivolt thermostats’. In homes across the USA, there are currently 3 types of heating systems in use. A thermostat is always designed to cater to one type of system, and it can not be used interchangeably.

Can thermostats be battery powered?





Many thermostats still use batteries, while others draw power from your home’s electrical or HVAC system. The typical battery-powered dial, switch, digital or programmable thermostat is going to take regular AA or AAA alkaline batteries, a button-style 3V lithium battery or a 9-volt battery.

Can you use a 24 volt thermostat on a millivolt system?

A line voltage thermostat needs to be connected to a power supply of fewer than 30 volts, while a millivolt thermostat needs only 0.75 volts and a line voltage thermostat needs 120 to 240 volts.

What type of thermostat is required on a millivolt room heater?

Millivolt thermostats use very low voltage thermostats (usually 750 millivolts).

Does Nest make a millivolt thermostat?

The Nest is not like a thermostat that typically uses internal relays to switch on/off the call for heat/cooling and thus don’t really care what the voltage being switched is. The Nest is all solid state, so likely will not work to switch a millivolt relay.

Do I need a millivolt thermostat?





Millivolt systems are not very common and are primarily used in direct- or top-vent wall furnaces. These types of systems require a special thermostat and don’t work with standard low-voltage thermostats. Millivolt thermostats use very low voltage, usually 750 millivolts (mV) or 0.75 volts.

Is Honeywell ct87k a millivolt thermostat?

It is NOT for millivolt systems, which are also 2 wire but work off typically 750 millivolt DC generated by a thermocouple constantly heated by the pilot light.

How do you wire a millivolt thermostat?

How do I Wire a Honeywell Millivolt Thermostat?

  1. Turn off the electricity to your heating unit, such as a furnace or boiler.
  2. Connect one thermostat wire to one screw terminal on your millivolt thermostat’s wall plate. …
  3. Connect the second thermostat wire to the second screw terminal on your thermostat.

Can you use a programmable thermostat with a gas fireplace?

Yes you can substitute a thermostat for that switch on the wall by your fireplace. You can add most any kind of digital thermostat or even add a remote with WiFi and adjust the temperature in your room without leaving the comfort of your easy chair or take a trip and adjust it from a nice warm beach.

What kind of thermostat do I need for a gas fireplace?



Millivolt Thermostats

Millivolt systems require a specific type of low voltage thermostat. Designed for use with gas fireplaces and some heating systems, our selection of millivolt thermostats can be used with or without an external power source.

Can you add a thermostat to a gas heater?

Adding a thermostat is not that complex, but you wouldn’t want to make a mistake because that could cause you a delay or a non-functioning heater. If you completely have no idea how to do this, then you’re in the right place.

How does a millivolt gas valve work?



Millivolt Gas Valve
This type of valve makes use of a standing pilot that continuously burns to heat a device, either a thermocouple or thermopile, which then produces a small amount of electricity – less than a single volt, hence “milli”-volt.

What’s the difference between millivolt and electronic ignition?

So what are the real differences between modern (IPI) and millivolt gas fireplaces? A millivolt system does not require any external power, and operates solely off of the pilot light being lit, whereas an electronic ignition system requires external power, usually a standard electrical outlet.

What is a millivolt remote control?

This wireless remote and receiver can be used with a millivolt safety pilot valve or electronic spark ignition for conveniently turning the unit on or off or using the thermostat feature to maintain a specified temperature.

What is a millivolt switch?

This light switch is specifically designed to control a gas log set that utilizes a millivolt pilot control. This pilot system has a small flame that generates power for the unit’s gas valve to operate. As a result, they do not require outside power to operate and can be used in the event of a power outage.

How many millivolts do you need to open a gas valve?



A new 750 should put out 750 if pilot flame is proper. Under load 550 is good. Alot of valves require min. 350mv to open burner.

Can I light my gas fireplace without electricity?

Most gas fireplaces can run without electricity. Gas fireplaces that have a standing or vertical pilot light can light with or without electricity. If your gas fireplace has a different type of ignition system, you will not be able to run it without electricity unless it has a backup battery.