Which material is NOT typically used for boiler heat exchangers?

Boiler heat exchangers are typically made from materials that can withstand high temperatures and are resistant to corrosion, ensuring efficient heat transfer and longevity. Aluminum tubing is not commonly used for this purpose because, while it is lightweight and has good thermal conductivity, it does not handle high temperatures as well as other materials.

Materials like plate steel, copper, and nickel alloys are preferred in boiler applications due to their strength, durability, and ability to endure the thermal stresses associated with hot water or steam. Copper, for example, is widely recognized for its excellent thermal conductivity and resistance to corrosion in heating applications. Nickel alloys also offer enhanced resistance to corrosion and high-temperature strength, making them suitable for boiler heat exchangers.

In contrast, aluminum's physical properties make it less suitable for the demanding conditions found in most boiler systems, where high thermal resistance and structural integrity are crucial.