Oil Furnace Parts: How Does an Oil Furnace Nozzle Work? Oil Furnace Parts: How Does an Oil Furnace Nozzle Work?

There are few oil furnace parts that are more important than the fuel nozzle. Without this small nozzle, there would be no ignition of the oil in order for heat to be produced. Oil-fired furnaces, most of the time in the form of a forced hot air furnace, are very common sights in many homes across the country. In many cases they have replaced wood burning stoves because of their cleanliness and convenience. However, when one simple part stops working, the entire furnace can shut down. This is especially true of the fuel nozzle.

Set it and Forget it

One of the many conveniences of the oil fired furnace is that you can simply set the thermostat to the setting of your choice and forget about it until you need to fill the tank with oil. Unlike having to cut tree length wood, split it so it fits in the stove, pile up the wood, clean out the ash, and stay on top of the stove to make sure the fire does not go out. Some of the oil furnace parts make this convenience possible. The thermostat is a great example, but the fan motor, the combustion chamber, and the fuel nozzle also play special parts.

Small Flow

The fuel nozzle is the tip at the end of the fuel line that emits the oil into the burn chamber in order for it to ignite. This is not a large amount of fuel at a time. In fact, it is not a stream of oil at all. The oil comes through the oil line with a lot of pressure, but is released through the nozzle through small droplets.

Easier Combustion

A steady stream of oil will only dilute the fire chamber and making it harder to ignite. A small mist, individual droplets of oil, will ignite much quicker and evaporate into the chamber.

Mixture of Electricity and Air

As the oil is evaporating in the fire chamber the furnace will be igniting it with a high voltage charge in the chamber. This, coupled with the blower bringing in air at the same time, produces the spark that keeps the furnace burning the oil when it is called to produce heat. The nozzle is regulated to the specifications of that particular furnace so that this mixture is optimal.

Different Sizes

Since there are many different size of oil burning furnaces, there are also different sizes of nozzles. These sizes are based on the size of the furnace and the BTU rating it has. One of the constant variables in all fuel nozzles is that they are aerated so that they do not spray the oil in a stream.

Cleaning is Important

As small as nozzles are, these oil furnace parts can bring the entire heating process so a very quick stop. Annual cleaning of these nozzles is very important to ensure that you do not lose heat in the middle of the night during the coldest time of the year. Most nozzles can be removed easily. Simply blow some air through it to remove the built up residue.


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