Why Propane?  

Propane is a versatile, multi-purpose fuel. It is highly portable, clean burning and non toxic.

Propane is often called Liquid Petroleum Gas (LPG). At normal temperature and pressure, propane is a gas. It changes to liqud when cooled and moderately pressurized - about twice the pressure in a normal truck tire. Liquid propane expands to a gas 270 times greater than its own liquid capacity, packing huge energy reserves into relatively small, light containers.

Even at -40C propane still vapourizes, meaning propane is a good choice of fuel in freezing temperatures.

Propane has a flame temperature of 3595 degrees, whereas natural gas has a flame temperature of 2770 degrees. In other words, propane burns hotter than natural gas. This is why propane is used to cut steel in industrial processes, and also why propane is a more economical choice than natural gas - it heats up faster, saving you fuel.