What distinguishes CPVC from PVC piping?

The distinguishing feature of CPVC (Chlorinated Polyvinyl Chloride) compared to PVC (Polyvinyl Chloride) is that CPVC is rated for higher temperatures. CPVC can typically withstand temperatures up to about 200°F (93°C), making it suitable for hot water applications, including hot water distribution systems. This characteristic makes CPVC a preferred choice for plumbing systems that require higher temperature resistance, while PVC is generally limited to lower temperature applications, around 140°F (60°C) for hot water.

The other options are not correct because CPVC is not necessarily cheaper than PVC; it usually costs more due to its higher heat resistance. Additionally, CPVC is a type of plastic and not made from metal, which rules out the metal option. Lastly, CPVC is not restricted to drainage use; rather, it can be used for both water supply and drainage applications.