Heating oil is any petroleum product or other oil used for heating; it is a fuel oil. Most commonly, it refers to low viscosity grades of fuel oil used for furnaces or boilers for home heating and in other buildings. Home heating oil is often abbreviated as HHO. Fuel oil is a refined petroleum product primarily used for heating homes and buildings, powering large marine engines, and fueling industrial boilers or furnaces to generate electricity. It is a residual byproduct of crude oil distillation, categorized into grades based on viscosity and density, with key applications in commercial heating, manufacturing processes, and shipping Key Uses of Fuel Oil : * Heating (Domestic and Industrial) : Light fuel oils (like No. 1 and No. 2) are widely used for heating homes, commercial buildings, and industrial boilers. * Marine Propulsion : Heavy fuel oil (HFO) is frequently used in large marine engines on ships * Power Generation : Fuel oil is used in industrial furnaces and boilers to generate steam for electricity production. * Industrial Processes : It serves as a fuel source for various manufacturing processes requiring high heat, such as manufacturing and processing. * Off-Road Machinery : Certain types of fuel oil, such as red diesel, are used in agriculture, rail transport, and construction equipment.