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Recommended Electric Heating Wattage And Circuit Size For Living Areas

Heating Chart For New Additions and Existing Rooms Of A Home

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An image of a baseboard heater.

Baseboard Heater

Timothy Thiele

Determining your electric heating needs is calculated by the room size. This includes the total living area of the room to be heated. Remember that if you are in a particularly cold area of the country, check with your local inspector or heating and cooling contractor for correct sizing for you area. Just because your electric baseboard heaters have thermostats, doesn't mean you can always turn it up high enough to keep up with the heating demands.

Using the chart below, try and size your electric heater as close to the appropriate wattage as possible. When in doubt, oversize the heater to assure that the unit can properly maintain the needed heat in your home.

Photo: Timothy Thiele

Heating Rating Needed For Living Area And Circuit Size

Manufacturers Recommended Heating Needs
Total Area Of Room (Sq. Feet)Recommended Heater Rating (Watts)Eectrical Circuit Size Needed (240-volts)
10090015 Amps
1501,35015 Amps
2001,80015 Amps
3002,70015 Amps
4003,60020 Amps
5004,50030 Amps
8007,20040 Amps
1,0009,00050 Amps
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