08.28.2025
PEX vs. Copper
PEX vs. Copper – What You Need to Know Before Choosing Your Water Lines 
When it comes to residential supply lines, the two most common choices are PEX (cross-linked polyethylene) and Copper. Both have unique advantages and drawbacks – and knowing them can save you thousands down the road.
PEX – Flexible & Modern
Flexible, easy to install, and requires fewer fittings – meaning fewer potential leak points. Resistant to freezing since it expands slightly with pressure, reducing burst risk. Lower cost than copper, making it budget-friendly for new builds or retrofits.
Downsides: PEX is sensitive to UV light (can’t be used outdoors), and in rare cases, low-quality fittings or improper installation can lead to leaks. Its life span is typically 40–50 years.
Copper – The Longtime Standard Durable, time-tested, and resistant to bacteria growth inside pipes. With proper installation, copper can last 50–70 years, making it a proven long-term solution. Handles heat and pressure well, and isn’t affected by rodents or pests. Downsides: Higher upfront cost. Copper is rigid, requiring more fittings (more leak points). Over decades, it can corrode, leading to pinhole leaks – especially in areas with acidic or mineral-heavy water.
The Bottom Line:• If you want flexibility, cost savings, and resistance to cold-weather bursts – PEX is your friend.
• If you prefer time-tested durability and don’t mind the higher investment – copper is a great choice.
Either way, the right material combined with expert installation is the best insurance against leaks and costly water damage.
Plumbing Medic has the experience and tools to ensure your home’s supply lines are safe, reliable, and built to last.