Economizer coils are commonly made from materials like copper, stainless steel, or carbon steel, ensuring durability and resistance to high temperatures and corrosion. They are designed with finned or bare tube configurations to enhance heat transfer efficiency. In boilers, economizer coils help increase steam generation efficiency, while in HVAC systems, they improve cooling performance by utilizing waste heat to assist in preconditioning air. Proper maintenance of economizer coils is essential to prevent scaling, fouling, or corrosion, which can affect their performance and longevity.