The Crucial Role of a Nozzle in an Oil Boiler
Oil boilers depend on a precise system of components to deliver heat efficiently, and one of the most critical parts is the nozzle. Its main job is to atomise the fuel — breaking it into fine droplets that allow for cleaner, more efficient combustion.
Key factors such as the nozzle’s spray pattern, angle, flow rate, and droplet size all determine how effectively the fuel mixes with air. A well-functioning nozzle helps maintain flame stability, reduces soot build-up, prevents harmful emissions, and improves overall energy efficiency.
However, when a nozzle becomes clogged or worn, the results can be costly: poor combustion, higher fuel bills, and even damage to the boiler. That’s why it’s essential to follow the manufacturer’s guidance and replace the nozzle annually. Regular servicing and inspections ensure your boiler continues to run safely, efficiently, and reliably.
Danfoss Oil Nozzles: Service and Replacement
At EOGB, we supply a wide range of heating spares, with Danfoss nozzles holding a key position. Known for their quality and precision, Danfoss is a trusted name when it comes to reliable, high-performing oil nozzles.
The Danfoss range is designed to suit a variety of burner systems, offering different spray patterns and angles to meet the unique demands of each application.
From their expert perspective, Danfoss strongly recommends replacing the oil burner nozzle once a year. This is not just a suggestion but a proactive step that delivers several important benefits: improved operating performance, enhanced reliability, lower heating costs, and reduced environmental impact.
Symptoms of a failing nozzle can include a noisy burner, sooty flames, reduced heating efficiency, or the boiler failing to ignite properly. Annual replacement is the best preventative measure.
“It is essential that you keep your oil fired boiler serviced to optimize efficiency, reliability and safety of your system. Replacing the nozzle is a hugely important part of the service and will ensure the best possible performance and also help keep emissions to a minimum”.
Stephen McElroy, Danfoss Key Account Manager Burner Components
What information should I look for when buying a replacement Danfoss nozzle?
Manufacturers design each nozzle with precise characteristics, and even small variations can affect combustion quality. If you order nozzles at EOGB, our Sales team will make sure you choose the right one for your burner.
The key details you should check are:
Spray angle: Affects how the fuel is distributed within the combustion chamber and must match your burner’s design (30 °, 45 °, 60 °, 80 °).
Flow rate Spray pattern: Ensures proper fuel-air mixing and efficient combustion for your specific burner type. (H, S, EH, ES, B).
Imagine you’re using a Danfoss 0.60 GPH 60°S nozzle. The 60° angle means the fuel spray is distributed in a medium-wide cone, suited for most standard combustion chambers. The 0.60 GPH figure indicates the nozzle delivers 0.60 gallons of fuel per hour at a set pressure (usually 7 bar/100 psi). The “S” stands for Solid spray, which evenly distributes fuel across the spray cone — ideal for certain chamber designs.
Bear in mind that throughputs differ between S and H gas oil nozzles compared to EH and ES kerosene nozzles. Always check the boiler data to ensure you are using the correct nozzle for the application.
“Danfoss Nozzles come in many patterns and sizes. The most common nozzles among EOGB customers are the 0.60 x 60ES and 0.75 x 80EH. The E before the S or H spray pattern stands for Enhanced for Kerosene applications. This means it has been calibrated with Kerosene, predominantly the most common domestic heating fuel in the UK. ES/EH Nozzle begin at 0.40Usgal – 1.10Usgal. The reason they don’t make Kerosene Enhanced nozzles past the 1.10-gallon size is because not many domestic properties running on Kerosene will require a larger output than 40kW and above”.
Callum Leach, EOGB Sales Manager