Line-Voltage Thermostats for Baseboard Heat

Baseboard and wall heaters need a thermostat that can switch their full current at 120 or 240 volts. The rating is what matters: add up the heaters' watts and divide by the voltage. A 2,000-watt heater on 240 volts draws about 8.3 amps. These thermostats are ordered by their maker-stated maximum load, highest first, so the first picks handle the most heaters.

Check the voltage and poles too. Double-pole models break both live legs of a 240-volt circuit; single-pole models break one. Line voltage can kill, so switch the breaker off and use a licensed electrician if you're unsure.

EIA's 2020 survey counted 7.65 million U.S. homes heated mainly by built-in electric units, each room usually with its own line-voltage thermostat.

#1 · 43.8583 A max

Honeywell Home CT410B Line-Voltage Thermostat

The Honeywell Home CT410B Line-Voltage Thermostat is rated by its maker for 120 V and 5263 W. At 120 volts that covers heaters totalling about 5,263 watts (amps times volts). Connectivity: Wi-Fi. Its listing shows 6,859 buyer reviews. It suits baseboard and wall heaters and room-by-room electric heat. Where it gives ground: household-voltage wiring; one thermostat per heater circuit. Warranty: 1 year warranty. The load checker does the watts-to-amps arithmetic for your heaters.

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#2 · 25 A max

Honeywell Home RLV3150A1004/E Line-Voltage Thermostat

The Honeywell Home RLV3150A1004/E Line-Voltage Thermostat is rated by its maker for 120 V and 3000 W. At 120 volts that covers heaters totalling about 3,000 watts (amps times volts). Connectivity: Wi-Fi. Its listing shows 466 buyer reviews. It suits baseboard and wall heaters and room-by-room electric heat. Where it gives ground: household-voltage wiring; one thermostat per heater circuit. One thermostat usually controls one room's heaters; add them up before choosing.

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#3 · 22 A max

Cadet T522-W Line-Voltage Thermostat

The Cadet T522-W Line-Voltage Thermostat is rated by its maker for 240 V and 5280 W. At 240 volts that covers heaters totalling about 5,280 watts (amps times volts). It's double pole. Connectivity: Wired. Its listing shows 121 buyer reviews. It suits baseboard and wall heaters and room-by-room electric heat. Where it gives ground: household-voltage wiring; one thermostat per heater circuit. Warranty: Warranty. Line vs low voltage explains why a smart 24-volt model won't do.

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#4 · 22 A max

King Electric ES230-R Line-Voltage Thermostat

The King Electric ES230-R Line-Voltage Thermostat is rated by its maker for 240 V and 5280 W. At 240 volts that covers heaters totalling about 5,280 watts (amps times volts). It's single pole. Connectivity: Wired. Its listing shows 56 buyer reviews. It suits baseboard and wall heaters and room-by-room electric heat. Where it gives ground: household-voltage wiring; one thermostat per heater circuit. Warranty: 1-year limited warranty. The load checker does the watts-to-amps arithmetic for your heaters.

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#5 · 16 A max

meross MTS200 Smart Line-Voltage Thermostat

The meross MTS200 Smart Line-Voltage Thermostat is rated by its maker for 120 V and 1920W at 120V. At 120 volts that covers heaters totalling about 1,920 watts (amps times volts). Connectivity: Wi-Fi. Its listing shows 328 buyer reviews. It suits app control of baseboard heat and room-by-room electric heat. Where it gives ground: household-voltage wiring; one thermostat per heater circuit. One thermostat usually controls one room's heaters; add them up before choosing.

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#6 · 15.8333 A max

Mysa BB V2-0-L Smart Line-Voltage Thermostat

The Mysa BB V2-0-L Smart Line-Voltage Thermostat is rated by its maker for 240 V and 3800 W. At 240 volts that covers heaters totalling about 3,800 watts (amps times volts). It's single-pole. Connectivity: Bluetooth, Wi-Fi. Its listing shows 180 buyer reviews. It suits app control of baseboard heat and room-by-room electric heat. Where it gives ground: household-voltage wiring; one thermostat per heater circuit. Line vs low voltage explains why a smart 24-volt model won't do.

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#7 · 15.8333 A max

Mysa BB.2.0.01.NA Smart Line-Voltage Thermostat

The Mysa BB.2.0.01.NA Smart Line-Voltage Thermostat is rated by its maker for 240 V and 3800 W. At 240 volts that covers heaters totalling about 3,800 watts (amps times volts). Connectivity: WiFi, NFC. Its listing shows 1,297 buyer reviews. It suits app control of baseboard heat and room-by-room electric heat. Where it gives ground: household-voltage wiring; one thermostat per heater circuit. The load checker does the watts-to-amps arithmetic for your heaters.

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#8 · 14.5833 A max

Honeywell Home RLV4305A1000/E1 Line-Voltage Thermostat

The Honeywell Home RLV4305A1000/E1 Line-Voltage Thermostat is rated by its maker for 240 V and 3500 W. At 240 volts that covers heaters totalling about 3,500 watts (amps times volts). Connectivity: Wired. Its listing shows 1,304 buyer reviews. It suits baseboard and wall heaters and room-by-room electric heat. Where it gives ground: household-voltage wiring; one thermostat per heater circuit. Warranty: 1 year limited warranty. One thermostat usually controls one room's heaters; add them up before choosing.

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The ranking in one table

How to choose

Add up the watts of every heater the thermostat will control and divide by the voltage; the thermostat's maximum current must be at least that. Then match voltage (120, 208 or 240 V) and poles to the heater's instructions.

Wi-Fi models add schedules and phone control but carry the same load limits. Have an electrician do the work if you're unsure; this is household voltage.

When another list fits better

For furnaces, boilers and heat pumps, use a low-voltage thermostat from the smart or programmable tables.

Questions shoppers ask

Our editors choose and order the picks from the makers' own statements; every pick meets the rule printed above. How we read a thermostat · Affiliate disclosure