There should be at least a 72” distance from the floor to the heater head for our electric heaters and at least 96” from the floor to the heater head when installing gas heaters, depending on the model. When installing wall mounted outdoor heaters to spaces with a ceiling, the clearance from the ceiling to the heater for electric models should be between 6” - 12” depending on the wattage. Clearances from the ceiling for gas models should be at least 36” without a heat deflector and at least 14” with a heat deflector. It is important to take into consideration local clearance codes and adjust to the above U.S. standard clearances depending on where you are located.