Heater Selection Tips

Learn how to select the righ heater for your home by identifying your voltage and wattage needs with our Heater Selection Tips below. 

Know Your Voltage

Before selecting an electric heater, determine if the voltage at your connection is 120 volt or 240 volt power supply.

3 ways to check your voltage:

  • The most accurate way to check your voltage supply is with a voltmeter.
    WARNING: This test needs to be performed with the circuit breaker ‘On’. If you are uncomfortable working with live electrical circuits, please consult an electrician.
  • If you're replacing an old heater, identify voltage on the old heater label.
  • Check your circuit breaker to identify either Single Pole 120 volt or Double Pole 240 volt.
 

Know Your Wattage

Refer to our helpful chart

Easily detirmine the wattage requirements of your room with our chart to the right.

Age of Home

Select the column with the age of your home. A heat loss calculation should be performed if your home falls outside of these standards.

The size of your room

Select the row with the closest square footage for the room you want to heat.

  • Rooms with greater than average window space, increase wattage by 50%
  • If wattage recommendation falls between two heaters, select the heater with higher wattage
General rule of thumb

The Wattage Selection Guide recommends approximately 6 watts per square foot for newer homes and 10 watts per square foot for older homes. If you live in a higher altitude or colder climate, we recommend adding 2 watts per square foot.

 
IMPORTANT CIRCUIT INFORMATION
Check and abide by all electrical safety codes

Circuits must be derated by 20%

A SAFETY CODE REQUIREMENT.
The maximum wattage allowed on a circuit is calculated by multiplying the derated amps by the voltage.

Example:
20 amp circuit with 240 volt application

  1. 20 amps x 20% = 4 amps
  2. 20 amps - 4 amps = 16 amps (max allowed)
  3. 16 amps x 240 volts = 3,840 watts (max allowed)

Heating circuit hints

When connecting an electric heater to 120-volt dedicated circuits:

  • Use a 20-amp single pole circuit breaker
  • Use 12/2 with ground wire
  • Reference National Electric Code 210.24

When connecting an electric heater to 120-volt existing circuits:

  • Reference National Electric Code 210.24

When connecting an electric heater to 240-volt circuits using:

a. 20 amp double pole circuit breaker,

  • 3,840 watts is max load allowed on a circuit
  • Use 12/2 with ground wire

b. A 30 amp double pole circuit breaker,

  • 5,760 watts is max load allowed on a circuit
  • Use 10/2 with ground wire. Reference National Electric Code 210.24