CPVC is a high-temperature plastic pressure piping system introduced for potable plumbing in 1959. It has also been used extensively in fire sprinkler systems since 1985. This material is also used for many industrial and process piping applications.
CPVC is a specially engineered thermoplastic and its molecular structure makes it different from conventional plastics. Its internal structure makes it an ideal choice for hot and cold water plumbing.
PVC is best for cold-water applications and pressure and non-pressure systems while CPVC is better for hot-water applications, water supply and fire sprinklers.
CPVC is recommended for applications where the maximum temperature will exceed 140 degrees Fahrenheit, but stay under CPVC's max rating of 200 degrees Fahrenheit. Another deciding factor in which material to use is the chemical makeup of media being handled in your application.
CPVC can't withstand extremely high temperatures like copper pipe can. CPVC is not suitable for climates with extreme temperature variations due to its high thermal expansion coefficient. CPVC is more expensive than many other piping options.
PVC and CPVC are the most common choice for drain lines in newer builds and “will likely outlast any homeowner” thanks to a lifespan of approximately 50 years. Furthermore, PVC and CPVC pipes better withstand water hammer, so no “knocking” pipes during the winter.
CPVC works very well as a potable water distribution pipe, making it an ideal choice for residential plumbing applications. While there aren't many codes that require CPVC, its long-lasting and durable characteristics make it an excellent choice in residential settings.
