This will protect against possible injury or loss of life from asphyxiation. Refer to your owner's manual for correct panel position. Using an unvented gas heater in your home could be a violation of the California Health and Safety Code. Unless an room heater has enough air from an outside vent or an opening window, all of the oxygen in a room can be used up, resulting in illness or death. The flames in these heaters are not fully covered, which could result in fires.
All gas appliances have a main burner flame and most also have a pilot flame.
Water heaters installed in garages must be elevated a minimum of 18 inches above the floor. Lower water heater temperature to prevent scalding accidents. Water temperatures above 125 F can cause severe burns or even death. Read your instruction manual before setting the temperature. It should contain information about temperature-limiting valves.