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Furnace (central heating): a furnace, or a heater or boiler, used to generate heat for buildings Boiler, used to heat water; also called a furnace in American English when used for heating and hot water in a building Find here online price details of companies selling Heating Furnace. Get info of suppliers, manufacturers, exporters, traders of Heating Furnace for buying in India. Learn about different types of furnaces, such as natural gas, oil, electric, propane, and wood burning, and how they work. Download a PDF file with pictures and examples of each type of furnace. Furnace, structure in which useful heat is produced by combustion or other means. Historically, the furnace grew out of the fireplace and stove, following the availability of coal for heating.