1 st type is CITY GAS (toshi gasu)

City gas is methane gas. It is usually called “natural gas” in English, but in Japanese, it is referred to as toshi gas because usually, only major cities have the infrastructure required to pipe this type of gas into homes. City gas is supplied to your home through underground pipes.

2nd one is LP gas

LP gas is “liquid petroleum” or propane gas.

It is a type of gas fuel (gaseous fuel) which is mainly composed of propane · butane etc. and can be easily liquefied at room temperature by compressing.  LP gas is supplied to residences via several tanks, usually secured to an external wall.

Differences

These are the main differences between using city and LP gas:

• City gas is less expensive to use than LP gas (please see below).


• LP gas has higher heat value (more specifically, about 24,000-kcal per one cubic meter versus about half that for city gas). Basically, LP gas releases twice as much heat when it burns.


• In case of a natural disaster, residences using city gas will tend to experience longer recovery times to restore gas usage.


• Accidental combustion is less likely with LP gas.

City gas tends to be more expensive than LP gas, in general, because labor costs are higher for supplying LP gas