CPVC vs. PEX Piping: What’s the Difference?

CPVC pipes: What They Are and Where They Work Best

CPVC is a rigid plastic pipe that’s been treated with chlorine to enhance its performance. It's known for its ability to handle hot water, making it a common choice for hot water supply lines. It’s durable, resists corrosion, and won’t react to chemicals in water, which can extend its lifespan. CPVC pipes are also relatively affordable and easy to cut, which makes it a popular choice to both DIYers and experienced plumbers.

It does have some limitations. It can become brittle over time, especially in colder climates or when exposed to UV light. This makes it less suitable for outdoor installations. Additionally, it requires solvent-based adhesives for installation, which can emit strong fumes and add drying time to the process.

• Can handle hot water up to 200°F
• Resists corrosive elements and chemical buildup
• Affordable and widely available

• Brittle in cold or outdoor environments
• Requires glue for connections
• Emits fumes during installation

PEX Tubing: What Sets It Apart?

PEX is a flexible tubing known for its versatility and ease of installation.

PEX tubing doesn’t need adhesives. It connects with expansion fittings (PEX A), crimp rings, clamps, or push-fit fittings, which speeds up the installation process. Its flexibility allows it to bend around corners, reducing the need for fittings and lowering the risk of leaks. PEX can also expand slightly, making it more resistant to freezing and cracking in colder climates.

That said, PEX does have its drawbacks. While it’s resistant to freezing, it’s not designed for prolonged UV exposure and can degrade quickly if left outdoors. PEX is also more expensive upfront, though the reduced labor costs can balance that out for larger plumbing jobs.

• Flexible and easy to install
• Resists corrosive elements
• Resists freezing and cracking
• No glue or fumes required

• Sensitive to UV exposure
• Higher upfront material cost
• May not handle extreme heat as well as CPVC
• Need expansion or crimping tools

Comparing CPVC and PEX: What You Should Consider

While both materials are excellent choices for residential plumbing systems, the right one depends on your specific needs.

1. Temperature Tolerance: CPVC can handle elevated temperatures, making it ideal for hot water lines in homes with high water heater settings. PEX, while heat-resistant, is better suited for temperatures below 180°F.
2. Installation Method: PEX’s flexibility and push-fit fittings make it faster to install, especially in tight spaces or when retrofitting an existing system. CPVC is a more labor-intensive installation process because it's rigid structure requires precise measurements, cutting, and gluing, which takes more time.
3. Climate Considerations: If you live in a cold climate, PEX’s ability to expand makes it a safer option for areas prone to freezing. CPVC, on the other hand, can become brittle in freezing temperatures and is best used indoors.
4. Longevity: Both CPVC and PEX are durable, but their longevity depends on the conditions they’re exposed to. CPVC can last decades indoors but may fail in outdoor applications due to UV resistance. PEX, when properly installed, offers similar durability but isn’t suitable for outdoor use.

FAQ

Can CPVC pipes and PEX pipes be used together?

Yes, it’s possible to use both materials in the same plumbing system. Special fittings or adapters are available to connect CPVC to PEX. This approach is common when retrofitting a home or replacing specific sections of a plumbing system. However, it’s essential to follow local building codes and consult a professional if you’re unsure.

Is one material safer for drinking water?

Both CPVC and PEX are safe for residential water distribution when installed according to manufacturer guidelines. CPVC is naturally resistant to leaching chemicals, while PEX is approved for potable water use by most plumbing codes. If you’re concerned about water taste or quality, check the certifications for the specific brand you’re considering.

Are there advantages over copper pipes?

If you've had to deal with as many pinhole leaks in copper as I have you you'll want to rip out your current pipes and have CPVC pipes or PEX pipes installed immediately. Did we mention copper pricing? Throw in a modified home run and manifold systems and your life will never be the same, no more water pressure loss if someone flushes the toilet while you're showering.