Patio gas is a type of gas that is used for outdoor appliances such as barbeques and patio heaters. It is generally stored in green cylinders and is filled with propane gas. Patio gas is designed to be compatible with regulators, which make it easy to connect the gas bottle to your BBQ or patio heater. Some brands of patio gas will also include an indicator on the side of the bottle, which will tell you how much gas is remaining in the bottle. Patio gas bottles are typically smaller than other types of gas bottles, and it is possible to buy patio gas bottles up to 13kg in size.