How to Use the Nozzle Calculator

1. Select the fuel type (Gas Oil or Kerosene).

2. Choose the nozzle pattern type—Danfoss EH/ES*, Danfoss H, S, B, Delavan A, W, B, or Monarch AR, R, NS, & PLP.

3. Select the nozzle size from the dropdown list.

4. Enter the appliance efficiency:

  • **If the efficiency is unknown, assume approximately 80% for a non-condensing boiler and approximately 90% for a condensing boiler.
  • For burner output calculations, set efficiency to 100%.

5. Adjust the pump pressure until the desired kW output is achieved:

  • If the output cannot be reached within the manufacturer’s recommended pump pressure range***, select a different nozzle size and recalculate.

Important Notes:

*EH/ES nozzles are not suitable for gas oil.

**Boiler efficiencies provided are approximate guides. Please consult the boiler manufacturer for precise information.

***Pump pressure requirements vary depending on the fuel type:

  • Kerosene typically requires settings between 100 and 145 psi (6.90 to 10 bar).
  • Gas oil generally requires settings between 174 and 319 psi (12 to 22 bar).

Always consult the pump manufacturer for the minimum and maximum pump pressure recommendations.

Disclaimer

This nozzle calculator serves as a general guide for estimating outputs based on Delavan, Danfoss, and Monarch nozzles at specified pressures. It is essential to always follow the manufacturer’s instructions when available.

Please be aware that different nozzle manufacturers utilise varying reference pressures, which can result in differing output values:

  • Danfoss uses a reference pressure of 8 bar for EH & ES nozzle types.
  • Danfoss uses a reference pressure of 10 bar for H, S, & B nozzle types.
  • Delavan uses a reference pressure of 6.89 bar for A, B, W nozzle types.
  • Monarch uses a reference pressure of 6.89 bar for AR, R, NS, & PLP nozzle types.

Consequently, at a given pump pressure, different nozzle patterns will produce varying throughputs (outputs). If, for example, an EH nozzle is replaced with an H nozzle, the throughput—and therefore the burner output—will change. It is crucial to verify pump pressure and nozzle size to ensure consistent output.

Example: A 0.50 GPH EH or ES nozzle set at 125 psi typically provides a burner input of approximately 20.12 kW. Swapping this for an H, S, or B nozzle at the same pressure could increase the burner input to approximately 22.43 kW, representing an increase of over 2 kW.

Additional Notes:

  • Delavan W nozzles are available up to 8.00 GPH.
  • Danfoss EH or ES nozzles are available up to 2.00 GPH; however, nozzles above 1.10 GPH are now obsolete and limited in supply.
  • Danfoss EH or ES nozzles are only suitable for kerosene.

Always consult with the burner or pump manufacturer to confirm recommended pump pressure settings.

EOGB cannot be held responsible for any faults resulting from misuse or misunderstanding of the information provided in this application. It is intended solely as a guide; it is the user’s responsibility to verify the accuracy and suitability of any information for their specific application.

All figures are based on field calculations published by OFTEC using there fuel density figures of 0.79Kg/lt (Kerosene) or 0.84Kg/lt (Gasoil). All nozzle capacity values kindly provided by Danfoss and Delavan