When is a two-pipe oil delivery system recommended for an oil burner?

A two-pipe oil delivery system is recommended when the fuel tank is located below the oil burner. In this system, one pipe is used to deliver the oil from the tank to the burner, while the second pipe returns any excess or unneeded oil back to the tank. This setup is particularly effective when the tank is positioned lower than the burner because it helps to overcome the gravitational influence and ensures a consistent supply of oil.

When a fuel tank is below the burner, it allows for better management of oil supply, reduces the chances of cavitation, and helps maintain a stable flow. This is crucial for the operation of the burner, ensuring that it has the necessary fuel available for efficient combustion. In contrast, a single-pipe system may struggle with fuel delivery in situations where the tank is positioned lower, leading to potential operational issues.