Red Seal Plumbing Practice Exam

A cast iron boiler's heat exchanger is constructed of what material?

1. Steel

2. Aluminum

3. Cast iron

4. Copper

The correct answer is: Cast iron

A cast iron boiler's heat exchanger is specifically designed to be made using cast iron material. This is because cast iron has excellent heat retention properties and is able to withstand high temperatures without warping or cracking. Steel and aluminum may also be used as heat exchanger materials, but they do not possess the same durability and heat-conducting abilities as cast iron. Copper may be used in some boilers, but it is not commonly used as the main material for the heat exchanger and is usually reserved for more specialized parts. Therefore, the best material for a cast iron boiler's heat exchanger would be cast iron itself.