If you are connected to mains gas and have a gas meter at your house, the likelihood is your boiler is gas and select this option

LPG is short for Liquid Petroleum Gas. If you have a fuel tank outside your house, in most cases you will not be connected to mains gas and select this option.

Look for an electrical cable, if you see one going into the top or side of your boiler, it is electric. Note. electric heaters do not have a pilot light (flame).

Select this option if you have an oil tank at your house and have oil delivered.