How to Install a Garage Heater

WINTER makes an unheated garage feel like a meat locker, rendering your tools and weekend projects unreachable. Bringing heat into the space isn't just about comfort; it's about preventing concrete floors from cracking and keeping fluids in your machines from thickening. A properly installed unit heater turns a frozen storage box into a year-round shop. Success here depends on electrical capacity and proper airflow. You are dealing with high-voltage equipment, so the focus must remain on rigid mounting and a clean, dedicated electrical run. When installed correctly, the unit will quietly cycle to keep your chosen set-point, turning that cold morning start into a manageable task.

  1. Find Your Wall Structure. Use a stud finder to identify the structural members on the wall where you intend to mount the heater. Mark the center of the studs and ensure there is enough clearance from flammable materials like wood shelving or fuel containers.
  2. Bolt Down the Bracket. Level the heater's mounting bracket against the wall studs and drill pilot holes. Drive heavy-duty lag bolts through the bracket into the studs to ensure the weight of the unit is supported by the frame, not just the drywall.
  3. Secure the Unit. Lift the heater housing and hook it onto the mounting bracket. Tighten the locking knobs or bolts provided by the manufacturer to secure the unit in place so it cannot shift during operation.
  4. Run the Power Line. Install a conduit from your main electrical panel to the heater location, feeding the required gauge of copper wire through the conduit. Use liquid-tight flexible conduit for the final connection to the heater to allow for slight vibrations.
  5. Connect the Wires. Open the heater's junction box and connect the ground, line, and neutral wires according to the internal wiring diagram. Ensure all wire nuts are tight and no stray copper strands are touching the metal casing.
  6. Power Up and Monitor. Flip the dedicated circuit breaker at the panel and turn the heater's internal thermostat to the 'on' position. Monitor the unit for the first thirty minutes to ensure it cycles off once it reaches temperature and there are no burning smells.