What Size PEX for House?
Choosing the right PEX size for your house ensures efficient water flow, consistent pressure, and code compliance. Here's a simplified guide to sizing PEX pipes for residential plumbing:
| Pipe Size | Typical Use Cases | Flow Rate (GPM) | Max Fixtures |
| 1/2" | Individual fixtures (sinks, toilets) | 4-5 GPM | 1-2 |
| 3/4" | Branch lines (multiple fixtures) | 8-10 GPM | 3-4 |
| 1" | Main supply lines, whole-house systems | 12-15 GPM | 6+ |
Key Factors Influencing Sizing
Fixture Count:
Use 3/4" for branches supplying 2+ fixtures.
Use 1" for main lines feeding multiple branches.
Water Pressure:
Low pressure (<40 PSI) may require larger pipes to maintain flow.
Pipe Length:
Runs >50 feet need larger diameters to avoid pressure drop.
Code Requirements:
International Plumbing Code (IPC) mandates 3/4" mains and 1/2" branches for most homes.
Recommended Setup for Typical Homes
Main Supply Line: 1" PEX (from street to manifold).
Branch Lines: 3/4" PEX (to bathroom/kitchen groups).
Fixture Lines: 1/2" PEX (final connection to sinks/toilets).
Pro Tips
Manifold System: Use a home-run layout with individual 1/2" lines to each fixture for balanced pressure.
Insulation: Insulate hot water lines to reduce heat loss.
Pressure Test: Always test system at 1.5x working pressure after installation.
About IFAN Plumbing Manufacturer
IFAN factory has more than 30 years of experience in the plumbing industry. We wholesale a variety of pipes and pipe accessories, including manifolds, valves and faucets.
Color, size and packaging are all customizable.
We provide you with a perfect and reasonable solution for your project.
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Phone:+86 15088288323
Email:Sales24-Ifan@Ifangroup.Com
