Furnace oil is also known as fuel oil, and is a heavy petroleum product used in boilers and furnaces for heating buildings and providing hot water. It is also used in marine engines and in some power plants. Furnace oil is a petroleum product that is made from the heavier fractions of crude oil during the refining process and is composed of several different hydrocarbons. It is thicker and less volatile than gasoline, and has a higher energy content than other types of fuel oil. Furnace oil is used primarily in commercial and industrial applications, but is also used in some residential applications.

Furnace oil is also known as fuel oil, and is a heavy petroleum product used in boilers and furnaces for heating buildings and providing hot water. It is also used in marine engines and in some power plants. Furnace oil is a petroleum product that is made from the heavier fractions of crude oil during the refining process and is composed of several different hydrocarbons. It is thicker and less volatile than gasoline, and has a higher energy content than other types of fuel oil. Furnace oil is used primarily in commercial and industrial applications, but is also used in some residential applications.