If you're repiping your home or building new, one of the biggest decisions is what material to use for your water supply lines. The two main contenders are PEX (cross-linked polyethylene) and copper. Both are code-approved, both work well, and both have legitimate pros and cons. Here's an honest comparison from a Central Texas plumber's perspective.
What Is PEX?
PEX is a flexible plastic tubing that's been used in plumbing since the 1980s in Europe and gained widespread adoption in the US over the past 20 years. It comes in red (hot), blue (cold), and white (either) and connects using crimp rings, expansion fittings, or push-to-connect fittings. PEX bends around corners, which means fewer connections and fittings than rigid pipe systems.
What Is Copper?
Copper has been the gold standard in residential plumbing for over 70 years. It's a rigid metal pipe that connects using soldered (sweated) joints. Copper comes in different thicknesses — Type M (thin wall, most common in residential), Type L (thicker, used for water service and underground), and Type K (thickest, used for main water lines).
Cost Comparison
PEX wins on cost — significantly. For a typical 3-bedroom, 2-bathroom Central Texas home, a whole-house repipe in PEX runs roughly $4,000–$8,000. The same repipe in copper runs $8,000–$15,000 or more. The cost difference comes from two factors: the material itself (PEX tubing costs about one-third as much as copper pipe per foot), and the labor (PEX installs much faster because it's flexible and uses mechanical connections rather than soldered joints).
For most homeowners in our service area — Taylor, Bastrop, Elgin, Giddings, and surrounding communities — the cost difference is the deciding factor. A PEX repipe delivers essentially the same performance at 40–60% of the cost of copper.
Durability and Lifespan
Copper has a proven track record of 50–70+ years in ideal conditions. It's resistant to UV light (important for any exposed outdoor sections) and doesn't leach chemicals into the water. However, copper corrodes over time — especially in areas with aggressive water chemistry. Central Texas water varies by municipality, but some areas (particularly those with well water) have water that's hard on copper.
PEX is rated for a lifespan of 40–50 years by most manufacturers, though it hasn't been in widespread US residential use long enough to confirm this in the field. PEX is resistant to corrosion and mineral buildup — the smooth interior surface doesn't accumulate scale the way copper does. However, PEX cannot be used outdoors or exposed to UV light (sunlight degrades the material), and rodents have been known to chew through PEX in certain situations.
Freeze Resistance
PEX has a significant advantage here. PEX is flexible and can expand when water freezes inside it, which means it's much less likely to burst during a freeze. Copper is rigid and has almost no expansion tolerance — when water freezes in a copper pipe, the pipe cracks or splits.
This matters in Central Texas more than people think. The February 2021 winter storm proved that our homes aren't built for sustained freezing temperatures. Burst pipes caused billions of dollars in damage across the state, and the vast majority were rigid copper or galvanized steel. Homes with PEX fared significantly better.
If freeze resistance is a priority — and after 2021, it should be — PEX is the better choice.
Installation Speed
PEX installs in roughly half the time of copper. PEX is flexible, so it can snake through walls, around corners, and between joists without elbow fittings at every turn. A typical PEX repipe takes 1–3 days. Copper requires cutting rigid pipe to length, fitting each joint, and soldering every connection — a more labor-intensive process that typically takes 3–5 days for a whole-house repipe.
Faster installation also means less disruption to your home. Fewer access holes in walls, fewer days without water, and lower labor cost.
Water Flow and Pressure
PEX and copper deliver very similar water pressure in a residential setting. PEX has a slightly smoother interior surface, which some studies show provides marginally better flow characteristics. Copper's rigid connections create no flex points where flow could be disrupted. In practice, most homeowners will notice zero difference in water pressure between the two materials.
One caveat: PEX manifold systems (where individual lines run from a central manifold to each fixture) can provide better pressure than traditional trunk-and-branch systems in either material, because each fixture gets a dedicated line rather than sharing.
Taste and Water Quality
New PEX can sometimes impart a slight plastic taste to water for the first few weeks after installation. This fades as the pipe cures. Running the water for a few minutes before drinking typically eliminates any taste. After the initial period, PEX does not affect water taste or quality.
Copper can leach trace amounts of copper into water, especially in the first year and in homes with acidic water. This is generally at levels well below health standards but can cause a metallic taste.
Our Recommendation for Central Texas
For the vast majority of Central Texas homeowners, PEX is the better choice for a repipe. Here's why: the cost savings are substantial (often $4,000–$7,000 less than copper for a whole-house repipe), the freeze resistance is a real advantage after what we saw in 2021, installation is faster with less disruption, and PEX resists the mineral buildup and corrosion that Central Texas hard water causes in copper over time.
Choose copper if: you have exposed outdoor supply lines that can't be shielded from sunlight, you have a strong personal preference for metal pipe, or your home is a high-end new build where copper aligns with the construction quality. We install both and are happy to do either — we just want you to make an informed decision.
Getting a Quote
If you're considering a repipe — whether it's because of old galvanized pipes, polybutylene, frequent leaks, or low water pressure throughout the house — call Kimco at (737) 260-7255 for a free estimate. We'll walk through your home, assess the current piping, and give you a flat-rate quote for PEX, copper, or both so you can compare. No obligation, no pressure. We serve homeowners in Lexington, Taylor, Elgin, Bastrop, Giddings, Rockdale, Smithville, and across Central Texas.