When I replace my old heater, can I replace it with a different size (wattage)?

For help selecting the right wattage for a room, please see our Heat Selection Guide. Installing a lower wattage heater will not cause a problem on the circuit, but if it does not supply enough wattage to heat the room, the heater may run continuously in an effort to bring the room temperature to the temperature set on the thermostat.

However, increasing the wattage may cause a problem if your electrical panel board (circuit breaker or fuse box) and supply wiring is not equipped to handle a higher load. All electrical work and materials must comply with the National Electric Code (NEC), the Occupational Safety and Health Act (OSHA), and all state and local codes.