If you've walked into a hardware store and seen pipes labelled PVC, CPVC, UPVC and sometimes HDPE, you've probably had the same question every contractor has: "they all look the same, do I really need to pick the right one?"
Yes. The wrong pipe in the wrong place is one of the most expensive mistakes in residential plumbing — a leaking hot-water line behind a tiled wall is a ₹40,000 repair.
Here's the plain-English version.
TL;DR — which pipe for which job
| Use case | Pipe to use | Why |
|---|---|---|
| Drinking water — cold | PVC or UPVC | Cheap, durable, safe for potable water |
| Drinking water — hot (above 60°C) | CPVC | PVC softens; CPVC handles up to 95°C |
| Drainage / waste / sewage | PVC SWR | Standard for waste pipes |
| Outdoor / sun-exposed | UPVC | UV resistant, won't crack |
| Agricultural / borewell | PVC AGRI | Cheaper, lower pressure rating |
| Underground / heavy load | HDPE | Flexible, won't crack with movement |
The 3-line difference
- PVC (Polyvinyl Chloride): the standard, cheap, works fine for cold water and drainage. Goes soft above 60°C.
- CPVC (Chlorinated PVC): same family, chemically tweaked to handle hot water. Slightly cream-coloured. More expensive.
- UPVC (Unplasticised PVC): stronger, more rigid than regular PVC. UV-stabilised so it survives outdoor sun. Standard for building drainage too.
Where to use each, room by room
Bathroom
Cold water lines (in walls, going to taps and tank): PVC or UPVC, 1/2" diameter typical.
Hot water lines (from geyser to shower/taps): CPVC, no exceptions. This is the most common mistake — people use regular PVC for hot water, it works for a year, then starts to soften and leak. By the time you see the leak, it's behind the tile.
Drainage (washbasin, shower, WC, floor trap): PVC SWR (Soil Waste Rainwater) pipes, typically 2" for washbasin, 4" for WC outlet.
Kitchen
Same as bathroom — CPVC for hot, PVC for cold, PVC SWR for sink drainage.
Overhead and underground tanks
Connections to tanks: UPVC 1" pipes are standard for inlet/outlet. UPVC handles the sun if exposed.
Borewell to underground tank: UPVC or HDPE for buried sections; UPVC for the riser pipe.
Rainwater downpipes
Standard PVC SWR pipes, 4" diameter, mounted external to walls.
Garden / agriculture
PVC AGRI pipes — lower pressure rating, much cheaper per metre, fine for sprinklers and drip irrigation.
Pressure ratings (the number on the pipe)
You'll see ratings like "Class 4" or "10 kg/cm²" printed on pipes. For household plumbing:
- Cold water inside walls: Class 4 (6 kg/cm²) is enough
- Cold water on pump line: Class 5 (8 kg/cm²) — pumps spike the pressure
- Hot water (CPVC): SDR 11 grade is standard for residential
Always go one rating higher if budget allows. Pipe cost is 5% of the plumbing labour cost — overspending here is the cheapest insurance you can buy.
Brands we stock and recommend
| Pipe type | Brand | Notes |
|---|---|---|
| PVC (general purpose) | Finolex, Prince | Industry standard, IS 4985 certified |
| CPVC (hot water) | Ashirvad, Finolex | Both are excellent. Ashirvad is slightly more available in TN |
| UPVC | Finolex, Prince | Finolex has the widest range |
| SWR (drainage) | Finolex, Prince | Any IS 13592 marked brand is fine |
| AGRI | Finolex | Cheaper alternative for irrigation |
The 5 plumbing mistakes that cause monsoon leaks
Mixing PVC and CPVC fittings. The threads look the same but the dimensions are slightly different. Always use brand-matched fittings: Finolex pipe with Finolex fittings, Ashirvad with Ashirvad.
Solvent cement applied to wet pipes. The solvent (also called PVC bond) needs dry surfaces. Wipe pipes clean, let them air-dry 30 seconds before applying.
Under-curing the joint. Solvent cement takes 12–24 hours to fully cure depending on humidity. Plumbers who pressure-test in 2 hours create micro-failures that leak 6 months later.
Skipping the brass FTA (Female Threaded Adapter) at the tap point. PVC threads strip after a few faucet replacements. Always end at a brass FTA, then attach the faucet — preserves the pipe forever.
No allowance for thermal expansion on hot lines. CPVC expands more than copper. A 5m run can grow by 25mm when hot. Build in a small loop or expansion joint at long runs.
Cost ballpark for a 2BHK home (May 2026)
| Item | Quantity | Cost |
|---|---|---|
| PVC pipes (cold water) | ~50m | ₹4,500 |
| CPVC pipes (hot water) | ~25m | ₹4,500 |
| UPVC (tank connections) | ~10m | ₹1,800 |
| SWR drainage (4") | ~20m | ₹4,200 |
| Fittings (elbows, tees, brass FTAs) | assorted | ₹6,000 |
| Solvent cement, teflon tape | ₹1,200 | |
| Subtotal | ₹22,200 |
Plus brass valves, tap fittings, water tank, etc. Plan for ₹35,000–₹50,000 for a complete 2BHK plumbing material bill (excluding labour).
What about ProFlex / PEX / multilayer pipes?
PEX (cross-linked polyethylene) is the future for residential hot-cold water — flexible, no fittings inside walls, no leaks. Slowly arriving in India through brands like Astral Foamtouch and Ashirvad Flowguard Plus. About 40% more expensive than CPVC for now, but worth considering for premium builds. Message us on WhatsApp if you want a PEX quote.
Bottom line
For 95% of Chennai residential builds:
- Cold water: Finolex or Prince PVC
- Hot water: Ashirvad or Finolex CPVC (never substitute with PVC)
- Drainage: Finolex SWR
- Outdoor: Finolex UPVC
All available at Suppliable Sholinganallur, delivered to your Chennai site in 60 minutes. Browse the full plumbing catalogue →
Plumbing materials team at Suppliable. WhatsApp us at +91 87786 27926 for a full-house plumbing BOM quote.