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A furnace works by drawing air inside a heat exchanger, where it is warmed with a flame of natural gas, propane or fuel oil, or with heated electric coils. A blower sends the warmed air through the house via metal ducts; it enters the room through a register or grill in the floor or wall. Indoor air is circulated continuously through the system, so a furnace filter is used to contain dust, pollen and other airborne particles. An older home might have a boiler, fueled by natural gas, liquid propane or fuel oil. A boiler works by heating water and circulating is through pipes to radiators, where it warms the surrounding air. Unlike a furnace, a boiler doesn't circulate air throughout the house, which is why the air in a boiler-heated home might seem "stuffier." Electric Resistance Heating Often referred to as "Strip Heat", they resemble a slinky type wire that is inside the Air handler. They are sized in KW ( Kilowatts), 5KW, 10KW, 15KW, 20KW. Each strip is rated at 5 Kw. If you have 20 KW heat strips then you have 4 strips. The only disadvantage is the power consumption. The advantage is they are very durable. Sequencers or relays turn the strips on and off. |
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Last modified: January 16, 2008 Webmaster- Steve DeViney |