HOME HEATING OPTION is a term used to describe the various methods of heating a home. The three most common options are OIL, GAS, and gasoil. OIL is a liquid fuel derived from petroleum that is burned in a furnace to heat a home. GAS is a combustible GAS, usually natural GAS, that is burned in a furnace to heat a home. Gasoil is a combination of diesel fuel and heating OIL that is burned in a furnace to heat a home.