Which factor is crucial for ensuring the optimal performance of an oil burner?

Proper oil viscosity is crucial for ensuring the optimal performance of an oil burner because it directly impacts the efficiency of fuel combustion. Oil viscosity refers to the thickness or flow properties of the oil. When the oil is at the correct viscosity, it can be atomized effectively by the burner nozzle. This ensures that the fuel is sprayed into the combustion chamber in a fine mist, which promotes better mixing with air and leads to more complete combustion.

If the viscosity is too high, the oil will not atomize properly, resulting in larger droplets that can lead to inefficient burning, increased emissions, and potential soot buildup within the burner and flue. Conversely, if the oil is too thin, it may cause flooding or other operational issues. Hence, maintaining the proper oil viscosity is critical for optimal burner performance and overall system efficiency.