Copper vs. PEX Repiping – Which Is Best for Your Home?

When it’s time to replace your plumbing system, choosing between copper and PEX piping is one of the most important decisions you’ll make. Both materials have their advantages and are commonly used in modern plumbing systems. At All Time Leak Detection of Phoenix, we help homeowners determine the best option based on budget, durability, water quality, and installation requirements.

If you’re considering repiping your home and need expert guidance, call (602) 854-8641 today for a consultation.

Understanding the Differences Between Copper and PEX Pipes

What Is Copper Piping?

Copper has been used in plumbing systems for decades due to its durability and resistance to bacterial growth. It is a rigid metal pipe that requires soldering at joints, making it a more labor-intensive installation process. Copper is known for its long lifespan and ability to withstand high temperatures and pressure.

What Is PEX Piping?

PEX is a flexible, plastic piping material that has become a popular alternative to copper in modern plumbing systems. It is easy to install, resistant to corrosion, and less expensive than copper. PEX is available in different colors to indicate hot and cold water lines, making it easier for plumbers to work with.

Comparing Copper and PEX – Pros and Cons

Durability and Lifespan

Copper pipes are extremely durable and can last 50 years or more if properly maintained. They resist UV damage, making them ideal for outdoor or exposed applications. However, they can corrode over time, especially in areas with acidic water.

PEX pipes typically have a lifespan of 40 to 50 years but do not corrode or develop scale buildup like copper. Because PEX is made of flexible plastic, it is less likely to develop leaks due to joint failures.

Cost Considerations

Copper is more expensive than PEX, both in material and labor costs. The price of copper fluctuates based on market conditions, making it a less predictable investment.

PEX is significantly cheaper to purchase and install. Because it requires fewer fittings and less labor, the overall installation cost is lower. For homeowners on a budget, PEX is often the more affordable choice.

Installation Process and Flexibility

Copper requires precise cutting, soldering, and securing of joints. The installation process is more complex, and repairs can be time-consuming.

PEX is highly flexible and can be routed through walls, floors, and tight spaces without extensive demolition. Its ability to bend and expand means fewer fittings and potential leak points.

Water Quality and Corrosion Resistance

Copper pipes naturally resist bacteria and algae growth, making them an excellent choice for maintaining clean water quality. However, they can corrode in areas with highly acidic or hard water, leading to leaks and metal contamination.

PEX does not corrode or develop scale buildup, making it a better choice for homes with water chemistry that may degrade metal pipes. However, PEX is not as resistant to UV exposure and should not be used in outdoor applications.

Freeze and Temperature Resistance

Copper pipes can burst if water inside them freezes, making them more vulnerable in colder climates. However, they handle high temperatures very well and are often used for hot water lines.

PEX is more freeze-resistant because it expands and contracts, reducing the risk of bursting. However, it has a lower heat resistance compared to copper and may not be ideal for high-temperature applications without proper insulation.

When to Choose Copper vs. PEX for Repiping

Best Applications for Copper Pipes

• Homes with high water pressure that require durable pipes
• Outdoor plumbing and exposed piping installations
• Hot water lines that require high-temperature resistance
• Homeowners who prefer long-lasting, traditional materials



Best Applications for PEX Pipes

• Homes that need a cost-effective repiping solution
• Areas with hard or acidic water that could corrode metal pipes
• Renovations where flexible piping is necessary for tight spaces
• Cold climates where freeze resistance is a priority