If you wish to use a propane heater, consult your local regulations for the safe use, hook-up and storage of propane products. These regulations may be under the control of local fire or municipal departments, county building codes, etc. Learn your local regulations and follow them.
With propane or natural gas heaters, when lighting or relighting the pilot or turning the heater on or off, refer to the manufacturer's instructions on the name and rating plate. This plate is attached to the heater inside the control compartment. Following these instructions will prevent injuries. Gas is explosive and flammable.
Article Src: National Pool and Spa Institute