Which type of pipe is NOT commonly used for residential water systems?

Galvanized pipes are not commonly used for residential water systems today due to several important factors. While galvanized piping was once widely used, particularly in older homes, it has largely fallen out of favor in modern plumbing installations for a number of reasons.

One of the primary issues with galvanized pipes is that they can corrode over time, leading to reduced water flow and potential leaks. The corrosion can cause rust and scaling, which can degrade water quality and contribute to health concerns. Additionally, as the interior of a galvanized pipe rusts, the pipe becomes increasingly narrowed, restricting the flow of water throughout the plumbing system.

In contrast, pipes such as PVC, CPVC, and polyethylene are known for their resistance to corrosion, ease of installation, and longevity. PVC and CPVC are commonly used for both hot and cold water systems while polyethylene is often used for underground applications or as a flexible option for various plumbing needs. These materials are typically more cost-effective and require less maintenance compared to galvanized pipes, which further contributes to their popularity in contemporary residential plumbing systems.