How do I know if I have a millivolt thermostat?
How do I know if I have a millivolt thermostat?

What is a millivolt thermostat?

A millivolt heating system is usually a floor heater or a wall heater that doesn't use electricity; for example, a gas fireplace or a gas-powered wall heater. Millivolt systems are regulated using thermostats specifically designed for the system, commonly known as 'millivolt thermostats'.

What is the difference between a millivolt thermostat and a 24 volt thermostat?

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. A millivolt thermostat consumes the least amount of energy while the line voltage type consumes the highest.

Where is a millivolt thermostat typically used?

Millivolt Thermostats 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.

How do you hook up 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 a Nest thermostat work on a millivolt system?

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.

Is Nest thermostat compatible with millivolt?

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.

Can I put a thermostat on my gas fireplace?

Gas fireplaces are versatile in many ways, including the controls that can be used for them. Any type of thermostat can be connected to a gas fireplace, though millivolt thermostats are best for the job. These can help your gas fireplace supply heat and ambiance to your home all winter long.

How do I install a millivolt thermostat?

0:292:08How to Correctly Wire the Thermostat – YouTubeYouTube

Can you use a 24 volt thermostat on a 12 volt system?

Quick answer: You can't use a 24volt T-stat in a 12 volt system. Just get a battery operated one.

Can you use any thermostat with any furnace?

Know Your Equipment & Your Wiring Not all thermostats are compatible with existing HVAC systems, especially smart thermostats! Some thermostats work only with furnaces and air conditioners, for example. Others may be designed to monitor heat pumps or multiple-stage heating and cooling systems.

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.

Will a Nest thermostat work on a millivolt system?

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.

Can you use any thermostat on a gas fireplace?

In Conclusion. Gas fireplaces are versatile in many ways, including the controls that can be used for them. Any type of thermostat can be connected to a gas fireplace, though millivolt thermostats are best for the job. These can help your gas fireplace supply heat and ambiance to your home all winter long.

Are all thermostats low voltage?

The most common type of voltage from a central heating and/or cooling system is 24 volts (24Vac). The old thermostat may say somewhere on the thermostat that it is for 24 volt (24Vac) or maximum 30 volts (30Vac). If you see 120 Vac or 240 Vac on the thermostat, a low voltage thermostat will NOT work with your system.

How do you check voltage on a thermostat?

1:395:57How to Test a Thermostat with a Multimeter! – YouTubeYouTube

Are all thermostats 24V?

The most common type of voltage from a central heating and/or cooling system is 24 volts (24Vac). The old thermostat may say somewhere on the thermostat that it is for 24 volt (24Vac) or maximum 30 volts (30Vac). If you see 120 Vac or 240 Vac on the thermostat, a low voltage thermostat will NOT work with your system.

Does Nest thermostat work with millivolt?

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 you need a special thermostat for gas fireplace?

If you're thinking of installing a thermostat for your gas fireplace, you may be wondering if you need a special type. We've done the research to give you an answer. No, gas fireplaces are very versatile and can be used with any type of thermostat, switch, or remote control.

How do I know if I have a high voltage thermostat?

If you have baseboard or wall heaters, you likely have line voltage. However, you never want to assume. High voltage thermostats are sometimes identifiable by removing the cover. If there is a high voltage warning, it's a line voltage thermostat.