Heating oil is a type of fuel used primarily for heating residential and commercial buildings. It is a liquid petroleum product derived from crude oil, specifically designed for use in oil-burning furnaces and boilers. Heating oil is known for its efficiency and ability to produce a significant amount of heat, making it a popular choice in colder climates. The most common form of heating oil is No. 2 heating oil, which is similar to diesel fuel. It is stored in tanks, either above or below ground, and is delivered by truck to homes and businesses. Heating oil is typically dyed red to indicate that it is not subject to the same taxes as on-road diesel fuel.