Which component is most likely to be cleaned or replaced if combustion issues arise?

When combustion issues arise in an oil heating system, the burner gun is often the component that requires cleaning or replacement. This is because the burner gun is responsible for atomizing the fuel oil and mixing it with air for proper combustion. If the burner gun becomes clogged with soot or debris, or if its components such as the nozzle become worn or damaged, it cannot operate efficiently. This leads to incomplete combustion, which can create a number of issues, including poor heating performance, increased emissions, and even safety hazards like soot buildup or the risk of a fire.

Cleaning or replacing the burner gun ensures that the fuel is being properly atomized and mixed, which is crucial for optimal combustion and operational efficiency. In contrast, while the oil filter, oil tank, and flue pipe can also play roles in the system's overall performance, they are typically less directly associated with combustion problems compared to the burner gun. The oil filter serves to clean the fuel before it reaches the burner, the oil tank holds the fuel, and the flue pipe is responsible for venting combustion gases. Therefore, if combustion issues occur, addressing the burner gun directly targets the source of the problem effectively.