New York Low Pressure Boiler COF Practice Test 2025 – The Complete All-in-One Guide to Achieve Certificate of Fitness Success!

The purpose of the oil return line in an oil heating system is to circulate oil back to the storage tank. In an operational oil heating system, the oil is drawn from the storage tank to the burner where it is atomized and mixed with air for combustion. After the combustion process, the unused oil needs to be returned to ensure efficient operation and maintain a proper oil supply in the system.

Transporting oil back to the storage tank helps to keep a consistent level of oil in the system, reduces waste, and ensures that any unburned oil can be reused, thus enhancing the overall efficiency of the heating system. This recycling of oil is crucial for the longevity of the heating system as well, as it minimizes the risk of oil degradation and maintains the overall health of the equipment.

In contrast, other options refer to different functions within the system that do not pertain to the oil return line's primary role. For example, transporting atomized oil to the combustion chamber falls under the function of the supply line, while pressure relief and filtration have their dedicated mechanisms within the heating system.