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The furnace is part of an HVAC or central heating system used to generate heat. Typically this is done with gas, a heat pump, or an electric element. For hot water and radiator based heating, use the boiler tag.

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Rural USA. We just had a gas furnace installed. The new furnace has a 1-gang junction box with a switch and a fuse. It's the 21st century, here, I swear. And not England. The furnace circuit … is tip-top. It's punched down into a modern service panel with perfectly typical 15A breaker, and if it needed something special, that really wouldn't be a problem. So why does the furnace also need a fuse? …
asked Oct 6 '17 by Harper