Furnace oil is a dark, viscous, residual fuel oil derived from petroleum refining, primarily used for industrial heating and power generation. Known for its high energy content, it is popular in boilers, furnaces, and marine engines. Synonyms include fuel oil, residual fuel oil, and bunker fuel.Key Aspects and Usage ExamplesIndustrial Applications: Used in furnaces, pre-heating large metal quantities, and producing steam.Power Generation: Commonly used as fuel for large-scale power plants and backup generators.Marine & Transport: Used for fueling marine vessels.Heating: Used for heating commercial and residential buildings.Production: Utilized in asphalt production.