Which maintenance activity helps ensure efficient operation of an oil burner?

Regularly cleaning the ignition system is a vital maintenance activity for ensuring the efficient operation of an oil burner. The ignition system plays a crucial role in the combustion process; any dirt, soot, or buildup on the ignition electrodes can create a weak spark, leading to incomplete combustion. This inefficiency can cause various problems, including increased fuel consumption and the potential for hazardous emissions. Keeping the ignition system clean ensures that it can produce a strong, consistent spark, facilitating optimal combustion and overall burner efficiency.

In contrast, increasing fuel pressure might sometimes be necessary for specific situations, but if the pressure is too high, it could lead to excessive fuel consumption and soot production. Replacing the fuel line is also important, but it's more related to preventing leaks or blockages than optimizing burner efficiency. Reducing airflow intake does not promote efficiency, as proper airflow is essential for complete combustion; insufficient airflow can lead to incomplete combustion and increased pollutants. Thus, maintaining a clean ignition system is the most direct way to ensure the efficient operation of an oil burner.