Gas Furnace
A gas furnace is a gadget that generates heat using a gaseous product fuel such as natural gas and propane. The choice of gas used is dictated by location of the user. The gas furnace consists of a metal box (exchanger) with a pilot light inside which is connected to the source of fuel and thermostat; for regulating the heat. The surrounding air is drawn in by the ductwork. The air is heated inside the exchanger and blown through the ductwork to the opposite side into the heat register of every room.
The gas furnace is a simple, cheap but effective way to warm a residential or business area. The gas for the furnace is readily available as it is easy to transport. It produces more heat as compared to electricity. Gas furnaces are known to generate heat more quickly. Natural gas has more advantages than most other heat sources; however as compared to renewable sources like solar and geothermal the cost of ownership is high.
The types of gas furnace include; conventional warm air furnace, induced draft furnace and condensing furnace all of which have varied performance capacity. The conventional warm air furnace has a standing pilot; and possesses the least efficiency. It draws air in from an opening at the front of the furnace by creating a natural draft. The improved version of the conventional warm air furnace is the induced draft furnace which has average performance because it uses an electronic ignition.
By the use of a fan it draws combustion gasses into the flue thereby increasing its performance. The high performing condensing gas furnace has a second exchanger and more heat is generated from the combustion process and the gas that comes out is cool. The cool gas can be vented out through PVC. This type of gas furnace has a very high performance; it used hot surface ignition.