
Electric line voltage thermostats are used to control electric heating systems, such as baseboard heaters, fan-forced heaters, and electric in-floor heating. They are commonly known as high voltage thermostats and operate on a voltage range of 120 to 240 volts. These thermostats deliver electricity directly to heaters and control the length of time each heater stays on to manage room temperature. They are easy to install and are identified by the presence of two or four thick wires attached to the back. Electric line voltage thermostats are a good option for those looking to upgrade their heating system to a smart thermostat.
| Characteristics | Values |
|---|---|
| Type of heating system | Electric |
| Voltage | 120V-240V |
| Number of wires | 2 or 4 |
| Wire thickness | Thick |
| Wire colour | White and black for 120V, red and black for 240V |
| Type of heater | Radiant, convection, resistance, cove, direct-wired furnace, wall, baseboard |
| Control | Directly controls heaters by switching the main power on and off |
| Installation | Easy |
| Cost | Low-cost fixtures |
| Energy savings | Energy savings for home lighting |
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What You'll Learn

Electric line voltage thermostats are used for electric heating systems
Line voltage refers to the amount of voltage running through an electrical socket or circuit, typically ranging from 120 to 240 volts. Most electrical appliances can handle this voltage range, which is why they work straight out of the box without the need for additional hardware like a transformer. Line voltage thermostats also fall into this category, as they are powered and operate at 120V-240V on average.
Line voltage thermostats are commonly used in homes with electric heating systems, as opposed to central heating systems that typically use low voltage thermostats. Electric heating systems generally require a thermostat in each room, and line voltage thermostats are well-suited for this purpose. They are quick and easy to install and operate, and they can be programmed to manage room temperature by controlling the length of time each heater stays on.
Upgrading to a smart thermostat is a popular option for many homeowners. Smart thermostats allow for easy control of heating and air conditioning via a smartphone, providing both comfort and savings. However, before evaluating smart options, it is essential to identify the type of thermostat currently in use to ensure compatibility with any upgrades.
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They control heaters by switching the power on and off
Line voltage thermostats are designed to directly control electric heaters, such as baseboard heaters, by switching the main power on and off to the heater. They handle more power than low-voltage thermostats, which control central HVAC systems. Line voltage thermostats deliver electricity directly to heaters, so they are able to control the length of time each heater stays on to manage room temperature. They work by measuring the room temperature and controlling power delivery to maintain a setpoint, or the temperature you set on your thermostat.
If the temperature in a room goes below the setpoint, the thermostat will turn the heater on. Once the desired setting is reached, the heating system will be turned off. Line voltage thermostats are commonly known as high-voltage thermostats and are typically used for radiant, convection, or resistance heaters that are powered by electricity. They are also used for cove heaters and in-ceiling radiant heat.
Line voltage thermostats are supplied directly from a standard 120V or 240V circuit and are mainly used for electric space heaters. They convert the electric current from the house (120V or 240V) into heat. They are powered and operate at 120V-240V on average. Most line voltage thermostats usually have single-pole wiring or double-pole wiring, which depends on the features that the heater and thermostat have.
Line voltage systems power common household items such as light fixtures, vacuum cleaners, ceiling fans, blenders, and coffeemakers. Most homes use high-voltage circuits throughout. If your home heating system doesn't have any ductwork and runs on electricity, you likely have electric line voltage thermostats throughout your home.
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They deliver electricity directly to heaters
Line voltage thermostats are designed to directly control electric heaters by delivering electricity to them. They are commonly known as high-voltage thermostats and are used to control electric heating systems such as baseboard heaters, wall heaters, cove heaters, and in-ceiling radiant heaters. These heaters can be resistance heaters, radiant heaters, or convection heaters.
Line voltage thermostats are powered by a standard 120V or 240V circuit and have thick wires. They directly connect the main electrical circuit, thermostat, and heaters, converting the high-voltage current into space heating. This means that they handle more power than low-voltage thermostats, which control central HVAC systems and require a transformer to reduce the voltage.
Line voltage thermostats work by measuring the room temperature and controlling power delivery to maintain a setpoint, or the desired temperature. Depending on how close the room temperature is to the setpoint, the thermostat will turn the heater on or off. If the temperature in the room goes below the setpoint, the thermostat will turn the heater on. Once the desired temperature is reached, the heating system will be turned off.
Line voltage thermostats are quick and easy to install and are commonly used in homes with electric heating systems. They are also found in industrial and commercial spaces.
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They are also known as high voltage thermostats
Electric line voltage thermostats are also known as high voltage thermostats. They are called line voltage thermostats because they are directly connected to the electrical line or circuit. This is in contrast to low voltage thermostats, which require a transformer to step down the voltage.
Line voltage thermostats are supplied by a standard 120V or 240V circuit and are mainly used for electric space heaters, such as baseboard heaters, direct-wired electric furnaces, and other heaters. They are also used for radiant, resistive heat, and convection heating units. These types of systems include fan-forced, in-ceiling radiant, cove, wall, and baseboard heaters.
The main difference between low and high voltage thermostats is in their size and the number of wires they have. Low voltage thermostats operate on 24V of electricity and have thin wires, while high voltage thermostats are powered by 120V or 240V and have thick wires. High voltage thermostats are also larger because they have more wires to connect.
High voltage thermostats are more commonly used in homes with electric heating systems. If your home heating system doesn't have any ductwork and runs on electricity, you likely have electric line voltage thermostats throughout your home. Electric home heat is usually controlled by line voltage thermostats, while central heating is typically controlled by low voltage thermostats.
It's important to know the type of thermostat you have if you're considering upgrading to a smart thermostat. Upgrading to a smart thermostat can help you control your heating and air conditioning more easily, increasing your comfort and savings.
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They are easy to install and operate using 120V-240V
Electric line voltage thermostats are used to directly control electric heaters, such as baseboard heaters, by switching the main power on and off to the heater. They are commonly known as high voltage thermostats and control electric heating systems. They deliver electricity directly to heaters and handle more power than low voltage thermostats, which control central HVAC systems.
Line voltage thermostats are easy to install and operate using 120V-240V. They are supplied directly from a standard 120V or 240V circuit and are mainly used for electric space heaters. Most appliances work straight out of the box with this voltage range, so there is no need for extra hardware like a transformer. This makes installation easier and more cost-effective.
The thermostat will have either two or four thick wires coming out of the back, which attach to wires in the wall with wire nuts. A single-pole model will have a 2-wire connection to the main circuit, while a double-pole model will have four wires. The number of wires depends on the features of the heater and thermostat.
Line voltage thermostats work by measuring room temperature and controlling power delivery to maintain a setpoint, or the temperature you set. If the temperature in a room goes below the setpoint, the thermostat will turn the heater on. Once the desired setting is reached, the heating system will turn off.
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Frequently asked questions
An electric line voltage thermostat is a thermostat that controls electric heaters such as baseboard heaters, radiant heaters, and convection heaters. They are typically used for electric heating systems and deliver electricity directly to heaters.
Line voltage thermostats are supplied directly from a standard 120V or 240V circuit and are mainly used for electric space heaters. They have thick wires and directly connect your main electrical circuit, thermostat, and heaters. Low voltage thermostats, on the other hand, operate on 24 volts of electricity and have very thin wires. They control central HVAC systems by signaling the unit to turn on or off, offering indirect heating.
If your home heating system doesn't have any ductwork and runs on electricity, you likely have electric line voltage thermostats. Line voltage thermostats usually have two or four thick wires coming out of the back that are attached to wires in the wall. They also have higher voltage, ranging from 120V to 240V.











































