Oil Nozzle Calculator



Oil burner systems are a cornerstone of heating and combustion applications, found in everything from residential furnaces to industrial boilers. The proper functioning of these systems relies on precise fuel-to-air ratios, which in turn depend on the correct nozzle size. The Oil Nozzle Calculator is a critical instrument for ensuring that the oil nozzle chosen for a particular system is the right fit, optimizing combustion efficiency and minimizing waste.


The Oil Nozzle Calculator employs a fundamental formula to determine the nozzle size required for a given oil burner system:

Nozzle Flow Rate (GPH) = BTU Output / (Fuel Oil’s Energy Content x Efficiency x Pressure Factor)


  • Nozzle Flow Rate (GPH) represents the gallons per hour flow rate of the oil nozzle.
  • BTU Output stands for the heat output of the system, typically measured in British Thermal Units per hour (BTU/hr).
  • Fuel Oil’s Energy Content is the energy content of the oil being used, usually expressed in BTU per gallon.
  • Efficiency pertains to the efficiency of the burner or combustion system, often presented as a percentage.
  • Pressure Factor accounts for the pressure at which the oil is delivered, which affects the flow rate.

How to Use?

Using the Oil Nozzle Calculator involves several steps:

  1. Gather Information: Collect data including the system’s BTU output, the energy content of the fuel oil, the burner’s efficiency, and the pressure factor at which the oil is delivered.
  2. Plug in Values: Insert these values into the formula: Nozzle Flow Rate (GPH) = BTU Output / (Fuel Oil’s Energy Content x Efficiency x Pressure Factor).
  3. Calculate: Use the calculator to compute the required nozzle flow rate (GPH).
  4. Select the Nozzle: Choose a nozzle size that matches the calculated flow rate to ensure optimal combustion performance.


Let’s illustrate the application of the Oil Nozzle Calculator with an example:

Suppose you have an oil burner system with a BTU output of 100,000 BTU/hr, using fuel oil with an energy content of 140,000 BTU per gallon. The burner is 80% efficient, and the pressure factor is 1.2. Using the formula:

Nozzle Flow Rate (GPH) = 100,000 BTU/hr / (140,000 BTU/gallon x 0.80 x 1.2)


Nozzle Flow Rate (GPH) = 100,000 / (168,000 x 1.2) = 0.595 GPH

In this scenario, you would select an oil nozzle with a flow rate of approximately 0.6 gallons per hour to achieve optimal combustion.


Q1: Is the Oil Nozzle Calculator applicable to all oil burner systems? A1: Yes, the calculator can be used for various oil burner systems, provided you have accurate data for the system’s BTU output, fuel oil energy content, efficiency, and pressure factor.

Q2: How often should nozzle size be calculated or adjusted? A2: Nozzle size should be initially calculated during system installation and periodically checked during routine maintenance to account for any changes in system parameters.

Q3: Can using the wrong nozzle size affect the system’s efficiency? A3: Yes, using an incorrect nozzle size can lead to suboptimal combustion, reduced efficiency, and increased fuel consumption, potentially causing operational issues and higher costs.


The Oil Nozzle Calculator is a vital tool in the arsenal of professionals working with oil burner systems. By ensuring the selection of the appropriate nozzle size, it plays a pivotal role in optimizing combustion efficiency, reducing waste, and maintaining the overall performance of heating and combustion systems. In an era where energy efficiency and sustainability are paramount, the Oil Nozzle Calculator emerges as a fundamental instrument in achieving precision and cost-effective operation in oil burner systems, benefiting both the environment and the end-users.

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