PVC vs Copper vs Steel Pipe

Three Main Piping Types

Most residential and commercial projects use one of three materials: PVC, Copper, or Steel. Each has different strengths, costs, and applications. Let's break down each one.

PVC (Polyvinyl Chloride)

What It Is

PVC is a plastic polymer pipe. It's lightweight, affordable, and easy to install. PVC comes in different "schedules" (wall thicknesses) — Schedule 40 is standard for most residential applications.

Best Uses

• Cold water supply lines
• Irrigation and outdoor watering systems
• Drain, waste, and vent (DWV) systems
• Underground water distribution
• NOT suitable for hot water or high-pressure steam

Key Advantages

✓ Cheapest option (50% less than copper)

✓ Easy to cut and assemble (PVC glue cement)

✓ No soldering required

✓ Corrosion-proof — lasts 50+ years

✓ Lightweight — easy to handle

Key Disadvantages

✗ Cannot handle hot water (softens above 140°F)

✗ Lower pressure rating than metal pipes

✗ Can degrade from UV exposure outdoors

✗ Joints must cure before use (glue time)

✗ Some jurisdictions restrict use for potable water

Typical Cost

½" PVC: $0.50-$1.00 per linear foot

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Copper Pipe

What It Is

Copper is a metal pipe, strong and reliable. It comes in three "Types": K (thickest), L (medium), and M (thin). Type M is most common in residential applications.

Best Uses

• Hot water supply lines (standard choice)
• Main plumbing runs and residential distribution
• High-pressure applications
• Where building codes specifically require it

Key Advantages

✓ Excellent for hot water (handles up to 250°F)

✓ High pressure rating (100+ PSI)

✓ Very durable — can last 50+ years

✓ Antimicrobial properties (resists algae/bacteria)

✓ Flexible — can bend slightly without fittings

Key Disadvantages

✗ Expensive (2-3× cost of PVC)

✗ Requires soldering (torch, flux, solder)

✗ Can pinhole-corrode in acidic water

✗ Heavier — more difficult to work with

✗ Theft risk in vacant properties (scrap value)

Typical Cost

½" Copper Type M: $1.50-$3.00 per linear foot

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Steel Pipe

What It Is

Steel is an iron-based metal pipe, strong and pressure-rated. Schedule 40 is standard. Steel comes in different grades for different applications.

Best Uses

• High-pressure industrial applications
• Gas lines (most common residential use)
• Compressed air systems
• Steam and very high-temperature applications
• Structural support/railings (sometimes)

Key Advantages

✓ Extremely strong — very high pressure rating (300+ PSI)

✓ Excellent for hot water and steam

✓ Affordable compared to copper

✓ Long lifespan if properly maintained

✓ Standard for gas and industrial use

Key Disadvantages

✗ Rusts/corrodes if not protected

✗ Requires threading or welding (not DIY-friendly)

✗ Heavier and harder to work with

✗ Galvanizing needed for outdoor use

✗ More expensive than PVC, similar to copper

Typical Cost

½" Schedule 40 Steel: $1.00-$2.50 per linear foot

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Quick Comparison Table

Feature	PVC	Copper	Steel
Cost	$$$	$$$$	$$$
Hot Water	No	Excellent	Excellent
Pressure Rating	Medium (100 PSI)	High (100+ PSI)	Very High (300+ PSI)
Corrosion Risk	None	Low (pinhole possible)	High (must galvanize)
Installation	Glue (easy)	Solder (medium)	Thread/Weld (hard)
Lifespan	50+ years	50+ years	50+ years
Best For	Cold water, irrigation	Hot water, main supply	Gas, high pressure

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Choosing the Right Pipe for Your Project

Residential Water Supply

Best choice: Copper or PVC

If you need hot water lines → Use Copper. If only cold water → PVC saves 50% cost. Many homes use both.

Gas Lines

Best choice: Steel (Schedule 40)

Steel is code-required for natural gas and propane in most areas. No alternatives.

Irrigation/Outdoor Water

Best choice: PVC

Corrosion-proof, cheap, and perfect for outdoor exposure. Use Schedule 40 or Schedule 80 for high-pressure systems.

Drain & Vent Systems

Best choice: PVC

Gravity-fed, so high pressure isn't needed. PVC is easy to assemble and meets all codes.