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Today’s oil furnace can be expected to last 15 to 20 years, and are much more highly efficient, thanks to the technology of the manufacturer. In the UK is commonly called a boiler, but is still the same oil furnace as in other regions with cold winters. Because of their long life and efficiency, it makes sense to have an oil furnace in your home or business. There is even a Waste oil furnace available now that uses waste oil for fuel. The oil furnace has a components different that a gas or propane burning furnace. For knowledge of how one functions, and for troubleshooting, it is beneficial to you to know the oil furnace parts and their interaction.

Oil burner of the oil furnace

The burner on an oil furnace is on the outside, typically. The heat exchanger has a blast tube entering it and has fuel oil mist sprayed from a hose onto the nozzle of the blast tube. There are electrodes on the nozzle which ignite the mist. On the side of the oil burner is a motor which pumps oil into the nozzle. The motor also operates the fan that blows onto the fire, forcing the hot air through the heat exchanger and on to the exhaust system. Ensure that the oil burner is kept clean. If the fan housing is clogged at the opening, there are brushes that will overheat. At the top of the oil burner is the ignition transformer. If your burner is not igniting, the electrodes on the ignition transformer may have burned out. If the ignition transformer is loose or very hot, replacement is needed. Make certain that all the oil furnace parts are kept dry.

Barometric Damper of the oil furnace

The barometric damper is easily identified and is a simple flap that can be opened or closed in the exhaust stack. When the furnace is on, it opens to draw extra air, aiding in the exhaust process. When the furnace is turned off, the damper closes to prevent entry of cold air from outside. This simple device is critical to the heating and safety of your home or business. It prevents carbon monoxide from entering your room. If the barometric damper is ever stuck, just move it back and forth a few times. It will always correct the problem.

Inspection Port

The oil furnace, like all furnaces, has a place where the heat exchanger can be inspected. It is unique hardware from other types of furnaces, in that it has an inspection port. This is because the heat exchanger becomes extremely hot on your oil furnace. The inspection port is a metal cover that slides open for your inspecting the heat exchanger. WARNING: If you slide the inspection port open, have your oil furnace turned OFF. Fire can shoot from the inspection port while your oil furnace is operating.


The oil burner, barometric damper, and inspection port are the three essential basic components to your oil furnace. There is sensitive “hi-tech” hardware, such as the thermostat, that requires a qualified technician to repair. However, you do have a level basic knowledge now, which will be helpful in troubleshooting your oil furnace. Even if you need a technician to repair any hardware, you can now have a generally knowledgeable conversation with that person. And when you do some oil furnace repair work to do yourself, just make sure you get the genuine oil furnace parts from the same brand as your furnace system. For more info, Call Us At (810) 653-4328.


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