CPVC vs UPVC vs composite pipes: which plumbing pipe for a flat in Gurgaon?

Where CPVC, UPVC and composite (PPR or multilayer) pipes each belong in a Gurgaon flat, how they handle hot water, hard water and pressure, what they cost relative to each other, the brands plumbers trust (Astral, Ashirvad, Supreme) and the mistakes that cause leaks inside walls.

By JP Pro Supply · Published 2026-10-19 · 5 min read · Gurgaon & NCR

Pipes are the one plumbing item you cannot change your mind about later. Once the CPVC is inside the wall and the tiles are on, a leak means breaking the bathroom. So the pipe choice deserves ten minutes of thought before the plumber's list is approved. Here is where each type belongs in a Gurgaon flat.

The three pipe families

UPVC (unplasticised PVC). Rigid, cheap, joined with solvent cement. Rated for cold water only; it softens above about 60 °C. Used for cold-water supply lines, overhead tank down-takes, and in larger sizes for drainage (SWR) and borewell casing.

CPVC (chlorinated PVC). Same family as UPVC but chlorinated to raise its temperature rating to around 93 °C. Joined with CPVC solvent cement. The standard for hot and cold internal plumbing in Indian flats for the last fifteen years. Sold in two wall-thickness classes: SDR 11 (thicker, for hot lines and higher pressure) and SDR 13.5 (thinner, for cold lines).

Composite and PPR. Two different products that get lumped together. PPR (polypropylene random) is a thick-walled plastic pipe joined by heat fusion; composite or multilayer pipe has an aluminium layer sandwiched between plastic layers, joined by press or compression fittings. Both handle hot water and higher pressure comfortably, both cost more than CPVC, and both need a plumber with the right tools.

Comparison

What we recommend for most Gurgaon flats

CPVC SDR 11 for hot lines, CPVC SDR 13.5 or UPVC for cold lines, UPVC SWR for drainage. This is what the majority of Gurgaon societies were built with and what most plumbers are good at. Buy a single brand across pipes, fittings and solvent cement; mixing brands of pipe and cement is the quiet cause of a surprising number of joint failures.

Upgrade to composite or PPR when:

• the flat has a pressure pump or is in a high-rise with high static pressure on lower floors;
• there is a solar or heat-pump water heater with long hot runs;
• the developer or consultant has specified it, which is increasingly common in premium Gurgaon projects;
• you simply want the longest service life and the plumber has done fusion work before.

Do not use UPVC anywhere a geyser line could reach. We still see it on lists for "bathroom cold line" where the plumber then tees the hot mixer feed off it.

Sizes

• Main down-take from the overhead tank: 32 mm or 40 mm CPVC or UPVC, depending on the number of bathrooms.
• Branch to each bathroom and kitchen: 25 mm.
• Final drops to each fixture (basin, WC, shower, geyser): 20 mm, occasionally 15 mm for a single tap.
• Geyser inlet and outlet: 20 mm CPVC SDR 11, with a brass or CPVC union so the geyser can be removed.

Undersizing the down-take is the usual reason a top-floor flat loses pressure when two showers run.

Brands

Astral popularised CPVC in India and remains the most-specified. Ashirvad (Aliaxis) is the other premium name, favoured by many Gurgaon consultants. Supreme, Prince and Finolex are reliable and a little lower in price. For composite and PPR, Astral, Ashirvad and Supreme all have ranges, as do several imported brands.

Fakes are less common than in wire but exist. Genuine pipe carries the brand, size, class and IS mark printed along its length, and the pack carries a hologram. Buy through an authorised dealer with a GST invoice.

Where leaks inside walls come from

1. Dry or wrong solvent cement. CPVC needs CPVC cement, applied to both surfaces, joined with a quarter-turn, and left to cure before pressure testing. Half the "pipe failed" complaints we hear are joint failures.
2. Brass transition fittings over-tightened with Teflon wrapped the wrong way or too thick, cracking the female CPVC thread. Use brass-insert CPVC fittings and hand-plus-a-quarter torque.
3. No pressure test. Insist on a 24-hour pressure test before tiling. It costs the plumber an afternoon and saves you a bathroom.
4. Pipes chased too shallow and nicked by the tiler's cutter.
5. Hot line in UPVC. Already covered. It happens more than it should.

Getting the material quoted

Send the plumber's pipe-and-fittings list with brand and class (SDR 11 or 13.5). A full flat usually comes to a manageable list of pipe lengths, elbows, tees, reducers, unions, brass transition fittings and solvent cement. We quote Astral, Ashirvad and Supreme against your list and dispatch across Gurgaon and NCR. See the plumbing material supply page and the bathroom renovation checklist.

Frequently asked questions

Can CPVC be used for hot water from a geyser?

Yes. CPVC is rated to about 93 °C, well above a domestic geyser's 60 to 75 °C. Use SDR 11 class on the hot line and a union at the geyser connection.

Is composite pipe better than CPVC?

It handles higher pressure and has a longer expected life, and it does not depend on a solvent joint. But it costs significantly more and needs a plumber with the right fusion or press tools. For most Gurgaon flats CPVC installed well is sufficient; composite makes sense for high-pressure, solar hot water or premium specifications.

Which is the best CPVC brand in India?

Astral and Ashirvad are the two premium, most-specified brands. Supreme, Prince and Finolex are reliable alternatives at slightly lower prices. The brand matters less than using the matching solvent cement and installing it properly.

What is the difference between SDR 11 and SDR 13.5 CPVC?

SDR is the ratio of diameter to wall thickness, so SDR 11 has a thicker wall and higher pressure rating. Use SDR 11 for hot lines and anywhere pressure is high; SDR 13.5 is adequate for cold lines in a normal flat.