A heating system in which air passes over a heat exchanger and into the conditioned space by gravity convection. Gravity heating systems are characterized by large air ducts that slope up from the furnace. Gravity heating can use any type of fuel such as natural gas, oil or coal. Many homes in Wisconsin that had gravity heating systems were originally fired with coal, like the one pictured here. Because the heat exchanger was usually made of heavy gauge steel these furnaces had a long life. Most were later converted to use natural gas or oil fuel. Also: Forced Air Heating System

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