Baseboard Heater Electric Wiring A typical circuit is installed to the location where the baseboard heater will be installed. The back of the heater has star punch dimples that allow nails or screw to pierce the sheet metal. 7. Electric baseboard heaters may operate on either 120 or 240 volts. Multi-watt baseboard heater right or left wiring 120V or 240V supply. The usual location to install baseboard heat is under your windows, making sure that the heaters run at least the length of the window--just be careful not to install them behind any furniture. Line-voltage thermostats for 240-volt heaters come in two types: single-pole and double-pole. Locate a spot on a wall opposite the baseboard heaters to mount the thermostat. M ysa for Baseboard Installation Manual . In particular, make sure you identify the wire leads marked "Line," which will be attached to the circuit wires that feed current from the power source, and those marked "Load," which will carry power onward to the baseboard heater. Drill punch or use a nail driver to put holes through the back enclosure at stud locations. It operates much the same way as a dimmer switch providing variable control to a light fixture. For use with electric baseboards, convectors and fan forced heaters, this thermostat is a practical option. The bare copper wires from each cable entering the box need to be joined together with a wire connector, and the metal box also needs to be grounded with a "pigtail" wire that links to the circuit grounding wires. Here, we’ll review the top 10 best thermostats for baseboard heaters on the market today. 8. 10. The thermostat may be attached to an external wall or to the heater itself. If wiring on the left, disconnect factory connector A. Connect supply wire to the heater. Checkout Our Top Pick Of Best Thermostats For Baseboard Heaters. A line-voltage thermostat for a baseboard heater is really just a variable switch installed along the electrical circuit that runs from the circuit breaker panel to the baseboard heater. Be sure the bottom of the cover connects to each bottom support bracket. Set the heater aside and drill an appropriately sized hole into the wall or floor. Some thermostats can be wired in either fashion. Leave the red wire disconnected and cap loose end with an approved wire connector, or wrap loose end with electrical tape. You can use a stud finder to do this. The seam at the junction of the wall and floor behind the heater should be caulked to prevent dust from being drawn into the room. Photos: a Marley MD-26 wall-mounted line-voltage thermostat used with electric baseboard heat. 11. Check the wires from the circuit breaker to the baseboard thermostat and look for wire burn marks, frayed areas, and other signs of damage. The supply wiring can enter the raceway without using a knockout if needed. Turn power back on at the electrical panel board. It shows the components of the circuit as simplified shapes, and the power and also signal links in between the devices. The thermostat can be mounted directly on the heater itself, or it can be mounted on the wall so that the circuit wiring passes through the thermostat first on the way to the baseboard heater. The thermostat works by sensing the temperature of the room and controlling the amount of current that passes through the wires to the heater. However, connecting a line-voltage thermostat is a fairly simple job that you can easily do. Replace wiring compartment cover and secure with screw previously removed. Do not install heater against vinyl wallpaper, paperboard, or low-density fiberboard surface. The heater includes nail point marks showing correct locations for mounting holes. For best results, place the heater under a window. Unlike the low-voltage thermostats that control central heating and air-conditioning systems, electric baseboard heaters use line-voltage thermostats that are installed as part of the full-voltage circuit powering the heater. We’ll provide an overview of the pros and cons of each product. 5. However, when I pulled out the thermostat I was confused by the way it is wired (see photo - both red wires connected to each other, and both black wires connected to each other). Unpackage the thermostat and carefully read the instructions and the wiring schematic. 9. 240V Wiring Instructions . If wiring on the right, disconnect factory connector B. *Please note: Do not remove permanently crimped wires. A wiring diagram is a streamlined conventional pictorial depiction of an electric circuit. Not only are they effective but they're so subtle and provide an even flow of heat most people have come to appreciate. The thermostat has a total of four wire leads: two marked "Line" that connect to the circuit feed wires entering the box from the circuit breaker panel, and two marked "Load" that connect to the circuit wires that run onward to the heater. Connect the black circuit feed wire to the wire lead on the thermostat marked "Line," using a wire connector. 9. Double-pole thermostats offer a true "off" function because the current to the baseboard heater is completely interrupted when the thermostat is off. For double-pole thermostats: Step 7. By using The Spruce, you accept our, How to Wire a 240-Volt Double-Pole Thermostat, How to Wire a 240-Volt Single-Pole Thermostat, How to Install a Line Voltage Thermostat for a Baseboard Heater, How to Make Pigtail Electrical Wire Connections, Understanding Electric Water Heater Wiring, How to Repair a Wall-Mounted Electric Heater, How to Replace a Standard 120-Volt Outlet Receptacle, How to Install a 240-Volt Electric Baseboard Heater, How to Wire and Install Single-Pole Switches, How to Install a Single-Pole Dimmer Light Switch, Understanding Electrical Grounding in Household Wiring, How to Wire an Electrical Circuit Breaker Panel, How to Fix a Hot or Buzzing Dimmer Switch. Route remaining thermostat wire marked T1 to the baseboard heater. Replace the front cover by fitting the top lip of the cover onto the tabs of each junction box and top edge of the element support brackets. The baseboard heater thermostat helps you regulate the temperature in the room that contains the heater. In single-pole thermostats, only one of the two hot wires entering the thermostat box is attached to the thermostat, and the other wire bypasses the thermostat box and continues to the baseboard heater. Read on for our selection of best thermostats for baseboard heaters. Use wire connectors to join the outdoing circuit wires leading to the baseboard heater(s) to the wire leads marked "Load" on the thermostat. Electric Heat Baseboard Installation & Wiring Manuals. Mount the heater securely to the wall with nails or screws. Either way, connecting a thermostat is a relatively straightforward process that most people can complete less than 1/2 hour. If the thermostat is controlling two or more thermostats from the same location, then each lead will be attached to multiple outgoing wires. Wiring for a 240-volt single-pole thermostat is similar to that for a double-pole, but in this case, one of the hot wires will simply bypass the thermostat and pass onward to the baseboard heater. This means that the baseboard will always have current flowing into it. In Hurry? A new line-voltage thermostat will need to be connected as part of the installation of the new baseboard heater. Determine where you want to install the heater. Remove the slotted knockout closest to the supply wires and install a strain relief connector. They must go into at least two wall studs. Mark the location on the wall or floor for the power supply entry into the heater. Single-pole thermostats are sometimes known as "two-wire" thermostats, while double-pole thermostats are called "four-wire." Connect the white supply wire coming from the circuit breaker to the same color supply wire feeding to the baseboard heater. Install two screws through the cover into the junction boxes. In particular, make sure you identify the wire lead marked "Line," which will be attached to a circuit wire that feeds current from the power source, and the one marked "Load," which will carry power onward to the baseboard heater. Connect remaining supply wire to other thermostat wire marked L2. The heater may sit directly on any floor surface, including carpet. A new lin… In a true 240-volt circuit (not a 120/240-volt circuit, such as a dryer or range circuit), both the black and white wires are hot; there is no separate neutral wire, as there is with a 120-volt circuit. If not, the arrangement will not function as it ought to be. A line-voltage thermostat can control a single baseboard heater or several heaters wired together. There will only be one 10-gauge ROMEX® in the third baseboard heater. Place it either under a window, along an outside wall, or as close as possible to an outside door. You must locate supply wires before mounting the heater. 240-volt heaters use less current to produce the same amount of heat as the same wattage 120-volt heater. Choose the type of thermostat specified by the manufacturer of the baseboard heater. Larry Campbell is an electrical contractor with 36 years of experience in residential and light commercial electrical wiring. Complete the wire connections on the baseboard heater, if this has not already been done. From my panel, I leave the 20A breaker with 12/2 wire to reach the first baseboard… Basic line-voltage thermostats use simple dial controls, but there are also more sophisticated electronic programmable models. Use a wire connector to join the white feed wire to the white outgoing wire(s). If you are keen on programmable baseboard heater thermostats, you can choose between Honeywell RLV4305A1000/E 5-2 Day Programmable Thermostat and HONEYWELL TL8230A1003 Thermostat Electric Heat Digital 7 day programmable Thermostat; however, the former one is a comparatively cheaper option. First, we'll review Cadet. These guidelines will be easy to comprehend and apply. Rotate the cover downward, pushing the bottom corners inward. 6. Make sure the circuit breaker controlling the wires is shut off, and use a non-contact circuit tester to test for current at the thermostat box. The common wire, sometimes referred to as the c-wire, is what’s responsible for delivering constant power to your thermostat. Most will specify either a single-pole or double-pole thermostat, though some may allow either type. Connect the wire lead on the thermostat marked "Load" to the black outdoing wire(s) leading to the heater(s), using a wire connector. It's economical, yet rugged. 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