CPVC Pipe Size Selector
Pick what you're plumbing to get the recommended CPVC pipe size for steady pressure and flow.
What size CPVC pipe for a bathroom?
Use 3/4 inch CPVC for the bathroom supply line and 1/2 inch for the branches to each tap, shower and the geyser, so pressure stays steady when two outlets run together.
How this works
Size pipes so that opening two outlets together doesn't collapse the pressure. A common home layout uses a 1 inch main, 3/4 inch bathroom supply lines, and 1/2 inch branches to each tap. Always use CPVC (not PVC) for hot water.
Size for pressure, not just flow
Pipes must be sized so that opening two outlets together does not collapse the pressure. A common home layout uses a 1 inch main, 3/4 inch bathroom supply lines, and 1/2 inch branches to each tap, shower and the geyser. Undersizing the supply line is the usual reason a shower goes weak when someone opens the kitchen tap.
Always use CPVC for hot water
Use CPVC — not ordinary PVC — for any hot line. CPVC is rated to about 93°C and stays stable on the geyser outlet, while PVC softens above roughly 60°C and will sag or burst. For higher-pressure runs, choose the SDR 11 class.
| Line | CPVC size | Why |
|---|---|---|
| Branch to a tap / basin | 1/2 inch | Feeds one outlet |
| Bathroom supply line | 3/4 inch | Feeds several outlets |
| Geyser inlet/outlet | 1/2 inch (CPVC) | Hot line — never PVC |
| House main line | 1 inch | Feeds all bathrooms & kitchen |
| Multi-floor riser | 1-1.25 inch | Larger bore for many floors |
Frequently asked questions
What size CPVC pipe for a bathroom?
Use 3/4 inch CPVC for the bathroom supply line and 1/2 inch for the branches to each tap, shower and the geyser, so pressure stays steady when two outlets run together.
Can I use PVC for the geyser line?
No. PVC softens with heat and can fail on a hot-water line. Use CPVC, which is designed for hot water up to about 93°C.
What size is the main house line?
A 1 inch CPVC main is typical for a home, feeding all the bathrooms and the kitchen from the tank or pump.
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