According to the American Iron and Steel Institute, the purpose of a blast furnace is to produce enough heat to extract iron from raw ore. Iron ore, coke and limestone are placed into a blast furnace and then heated unti... More »

Hot-blast wood furnaces don't use electricity to generate heat, but almost all newer models use electricity for various components. Most are also attached to electric thermostats. More »

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A hot blast furnace has preheated air blown into it. The hot blast technique allows furnaces to operate at higher temperatures while increasing its capacity. This technique is considered one of the most important advance... More »

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Hot-water furnaces heat, store and distribute water throughout a home or building. Various types of furnaces use different fuel sources for heating and have varying storage capacities. More »

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A gas furnace is a part of a heating system, the purpose of which is to convert gas to heat. Gas furnaces are most commonly used in residential systems in cold weather climates. More »

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The annual fuel utilization efficiency measures the efficiency of a furnace by comparing the annual heat output of a furnace to the total annual fossil fuel energy consumed by that furnace. The Federal Trade Commission r... More »

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A Payne furnace provides heat to a home by circulating warm air through ductwork. Payne sells a range of high-efficiency gas furnaces with a variety of features. More »

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