• Propane has a narrow range of flammability. The propane/air mix must contain 2.2 to 9.6 percent propane vapor to ignite. Any less than 2.2 percent and the mixture is too lean to burn. Any more than 9.6 percent and the mixture is too rich to burn.

• Propane will not ignite when combined with air unless the source of ignition reaches at least 940°F. In contrast, gasoline will ignite when the source of ignition reaches 430° to 500°F.

• Propane is released as a vapor from a pressurized container. Propane is stored as a liquid in its tank. In the unlikely event that liquid propane leaks, it will vaporize and dissipate into the air.

• Propane is virtually odorless and colorless in its natural state, so a commercial odorant is added to help you detect container leaks.

• People with electric water heaters spend an average of 30 percent more per month to heat their water than people with propane gas water heaters.