New York Low Pressure Boiler Certificate of Fitness (COF) 2025 – 400 Free Practice Questions to Pass the Exam

The primary function of a preheater in an oil-burning system is to heat the oil before it enters the burner. Heating the oil reduces its viscosity, making it easier to atomize and ensure more efficient combustion. When the oil is preheated, it flows more freely and can be mixed with air more effectively, which leads to a more stable and complete combustion process.

This is crucial for maximizing thermal efficiency and minimizing emissions, as well as preventing potential issues that could arise from using oil that is too thick or viscous at lower temperatures. Properly heated oil also helps in maintaining consistent burner operation and can prevent issues like incomplete combustion, which can lead to soot formation or equipment damage.

While other options mention different functions related to oil, they do not pertain to the primary function of a preheater in this context. The focus on heating the oil emphasizes the importance of preparing it for optimal performance in the combustion process.