An oil furnace is an object that uses oil in the form of a mist to create heat. The furnace is made up of several smaller elements, including burners and controls.
Since oil is generally a messier fuel, most individuals prefer to use natural gas or electric appliances to warm their homes. Nonetheless, oil is still a popular source of heat in the 21st century, especially in the colder regions of the United States. The performance of a heater is estimated by its percentage of Annual Fuel Utilization Efficiency. An AFUE of 80 percent or more is deemed exceptional for an oil furnace.