What type of ignition uses a spark that stays on for the entire time the burner runs?

The correct answer refers to continuous ignition, which is a method where a spark remains active for the entirety of the burner's operation. This ensures that the fuel is consistently ignited as long as the burner is running. The continuous spark provides a reliable and stable ignition source, minimizing the risk of incomplete combustion or unburned fuel, which can lead to inefficiencies or hazardous situations.

Continuous ignition systems are used in applications where a constant flame is needed, particularly in certain types of oil burners. The maintenance of the spark throughout the operation allows for immediate ignition of the fuel as it is delivered to the burner, ensuring a smooth and continuous heating process. This method contrasts with other ignition types, such as interrupted or intermittent ignition, which may only create a spark during the initial ignition phase and not while the burner is actively running.