To install an electric baseboard heater, select an installation location, connect the wires in the heater to the circuit breaker, and mount the baseboard heater to the studs. To test and run the heater, turn on the power at the circuit breaker and then the heater.
Baseboard heaters are typically mounted on the lower portion of an outside wall. Ideally, the baseboard heaters should be placed below a window to take advantage of the air movement. Review the manufacturer's guidelines, since not all baseboard heaters can be installed near curtains or furniture. Avoid installing the heater below electrical outlets, because dangling cords are a fire hazard.
Once the installation location is determined, turn off power for the designated circuit breaker. Baseboard heaters come with their own junction box, so one does not need to be installed. Units are available in 120- or 240-volt options. For 120-volt heaters, the unit needs to be connected to a 20-amp breaker, and a 240-volt unit requires a two-pole 20-amp breaker. Pull a 12-2 non-metallic sheathed wire from the circuit breaker panel to the installation location, and make the necessary electrical connections.
To mount the baseboard heater, mark the holes using the mounting bracket, and pre-drill them. Secure the baseboard heater with woods screws through the mounting bracket.