What You Need To Know About Domestic Furnaces-Part 1

In British English, the term furnace is used exclusively to mean industrial furnaces which are used for purposes, such as the extraction of metal from ore (smelting) or in oil refineries and other chemical plants. However, in Canadian English, the term furnace on its own is generally used to describe household heating systems based on a central furnace. A household furnace is a major appliance that is permanently installed to provide heat to an interior space through intermediary fluid movement like air, steam, or hot water. The most common fuel source for modern furnaces in Canada is natural gas; other common fuel sources include LPG (liquefied petroleum gas), fuel oil, coal or wood. In some cases electrical resistance heating is used as the source of heat, especially where the cost of electricity is low.
Combustion furnaces always need to be vented to the outside. Traditionally, this was through a chimney, which tends to expel heat along with the exhaust. Modern high-efficiency furnaces can be 98% efficient and operate without a chimney. The small amount of waste gas and heat are mechanically ventilated through a small tube through the side or roof of the house.

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