What Are the Different Types of Furnace Oil Nozzles?

The furnace nozzle is the "tiny heart" of an oil-heating system that keeps the flame producing a steady stream of heat. The role of the nozzle is to make combustion possible in a short period of time by breaking up oil into minuscule droplets. Delavan Spray Technologies, experts in spray nozzle manufacturing since 1935, asserts that the high-pressure atomizing nozzle is the heating industry standard.

Hollow Cone Nozzle (Type A)

Perfect for small flame retention burners, hallow-cone nozzles provide stable spray angels.  High-viscosity oil maintains a spray of fine droplets outside of the main spray-cone area—an advantage because such fuels tend to reduce spray angels. The result is a stable flame regardless of the fuel’s viscosity.  A Type A nozzle maintains stable patterns and compensates for increases in droplet sizes better than solid spray cones, thereby enhancing ignition. It also ensures low-noise combustion. 

Solid Cone Nozzle (Type B)

Solid-cone nozzles are designed to provide smooth ignition of larger burners.  They are also useful when the oil burner’s air patterns are heavy or when long fires are necessary. Type B nozzles distribute droplets of atomized fuel in a uniform fashion.  Its spray pattern becomes progressively hallow in higher flow rates. The solid-cone nozzle provides efficient combustion. 

Type W Nozzle

The Type W nozzle produces a more hollow spray at lower flow rates and more solid sprays at higher flow rates.  However, the spray produced by this nozzle is never entirely solid or hallow. Therefore, it is often used in place of hallow or solid cone nozzles as it is less impacted by burner air patterns.  Its an all-purpose atomizing nozzle.

Type MH Nozzle

The Type MH nozzle is specially designed for small burners.  It minimizes the blockages caused by low flow rates. This type of furnace oil nozzle is best suited for low-capacity mobile home burners. 

Specialty Furnace Oil Nozzles

Many manufactures provide a wide array of nozzles to suit a variety of applications.  As a general rule, these alternative nozzle types support specialized needs involving efficiency, corrosion resistance or other unique reasons. They do not necessarily represent those typically employed in meeting heating industry standards.  Yet, many of these specialized nozzles tend to be based on the general design of the Type W nozzle, the hallow-cone nozzle or the solid-cone nozzle.

About the Author

Christina Hadley holds a Bachelor of Arts in design. She writes copy for an assortment of industries. Her work also appears in the "Houston Chronicle" small business section. Hadley is a UCLA-certified computer professional. The British Museum recently featured one of her digital images in an exhibit.