What is the most commonly used material for fuel oil supply lines?

Steel is the most commonly used material for fuel oil supply lines due to its durability and resistance to corrosion. It can withstand high pressure and temperatures, making it suitable for a variety of systems that transport fuel oil. Steel's strength and ability to handle large volumes of oil without risk of leakage make it a preferred choice in the HVAC industry.

In addition to durability, steel also has the advantage of being readily available and cost-effective compared to other materials. Its robust construction minimizes the risk of damage during installation and operation, ensuring a reliable fuel supply.

Other materials, like copper, aluminum, and PVC, may have specific applications but do not meet the same standards required for fuel oil supply lines. Copper may corrode in the presence of certain oils, aluminum might not provide the strength needed, and PVC is not typically used for such applications due to its susceptibility to chemical degradation when exposed to oil.