Electric baseboard heaters are a cost-effective and energy-efficient way to heat individual rooms without the need for ducts. Whether you’re replacing an old heater or installing one for the first time, this guide will walk you through the process step by step.
Install Electric Baseboard Heating
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Baseboard heater (120 V or 240 V)
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Thermostat (wall-mounted or built-in)
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NM-B cable (12 AWG for 20A, 10 AWG for 30A)
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Double-pole circuit breaker
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Voltage tester, wire stripper, screwdriver, level
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Cable clamps, drill, fish tape
Step 1: Choose the Right Heater
Voltage & Wattage
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240 V models are more efficient and require less amperage.
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Wattage Rule of Thumb: 10 watts per square foot.
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Example: A 150 sq. ft. room needs a 1,500-watt heater.
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Sizing Example
| Room Size | Required Wattage | Suggested Heater |
|---|---|---|
| 100 ft² | 1,000 W | 4 ft (240 V) |
| 150 ft² | 1,500 W | 6 ft (240 V) |
Step 2: Choose the Location
Install the heater:
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Along an exterior wall, preferably under windows.
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With at least 12″ clearance in front and 6″ on each side.
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Away from furniture, drapes, and outlets.
Step 3: Prepare the Wiring
⚠ Important: Always turn off the power at the breaker panel before working with electricity.
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Install a thermostat wall box (if using a wall-mounted thermostat).
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Run electrical cable from your breaker panel to the thermostat, then to the heater.
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Use a double-pole breaker for 240 V heaters.
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Ground the circuit properly and label wires clearly.
Step 4: Install the Heater
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Remove the heater cover and locate the wire knockout.
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Mount the heater to wall studs using screws, ensuring it is level and flush.
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Feed the electrical cable through the knockout with a clamp.
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Connect the wires:
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240 V = two hot wires + ground (no neutral needed).
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Match color to color (usually black and red for hot, bare for ground).
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Step 5: Wire the Thermostat
Wall-Mounted Thermostat
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Wire the thermostat between the breaker and the heater.
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Follow the manufacturer’s wiring diagram.
Built-In Thermostat
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Mount directly on the heater (if supported).
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Connect wires as specified in the manual.
Step 6: Power On and Test
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Reattach the heater cover.
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Restore power at the breaker panel.
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Turn on the thermostat and check for heat.
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Expect a slight odor during the first use—this is normal as dust burns off.
Final Tips
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Use proper wire gauge for your breaker amperage.
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Do not install under outlets, and avoid blocking airflow.
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Always follow local codes—a licensed electrician may be required in your area.
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Keep heater clean and dust-free for safety and efficiency.
Summary Checklist
Measure the room and choose the right wattage
Plan heater placement with proper clearance
Run a dedicated circuit from the panel
Mount the heater and connect wiring
Install thermostat and test operation
If you found this guide helpful, consider sharing it or leaving a comment below. Have questions about hydronic baseboards or multi-room zoning? Let me know!
