CPVC vs PVC Pipe: What Each One Is Rated For

Quick answer: Use PVC for cold water lines up to the house and for drain, waste and vent piping. Use CPVC for hot and cold water inside the house. Charlotte Pipe publishes a 140°F maximum operating temperature for PVC and 180°F for copper tube size CPVC (FlowGuard Gold). Georgia’s plumbing code, as published on UpCodes, requires hot water distribution pipe rated for at least 100 psi at 180°F, and its water distribution table lists CPVC but not PVC. The two also differ in outside diameter and in solvent cement, so they are not interchangeable mid-run.

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✓ Written & reviewed by Isaac, a licensed Georgia plumber (journeyman) · Last reviewed September 2026

One letter separates the two names and almost everything else about them is different: the temperature they survive, the outside diameter of the pipe, the can of cement that bonds it, and the part of the house they belong in. Get the pair confused on a repair and the joint either fails or never bonds at all.

PVC vs CPVC at a Glance

Figures come from Charlotte Pipe’s plastics manual, Spears’ CTS CPVC guide and JM Eagle’s data sheet, plus the Georgia code text. Pressure numbers are for 1/2 inch pipe carrying water: Schedule 40 for PVC, copper tube size for CPVC.

Schedule 80 CPVC (Corzan) is a different product from copper tube size CPVC: light gray, iron pipe size like PVC, and rated to 200°F by Charlotte. It takes orange heavy-duty cement and a primer (Charlotte, Lubrizol). The rest of this page explains the rows above.

What Is PVC Pipe?

PVC is polyvinyl chloride. The pressure-rated version is made to ASTM D1785, a specification that covers PVC pipe “made in Schedule 40, 80, and 120 sizes and pressure-rated for water.” It is the rigid white or gray pipe on cold supply, irrigation, pool and utility lines. Those two colors are the two wall thicknesses of the same pipe — Schedule 40 vs Schedule 80 PVC sets out what each one is rated for.

The same white Schedule 40 pipe also does drainage duty. Charlotte Pipe’s Schedule 40 listings are dual-marked to ASTM D1785 and ASTM D2665, the drain, waste and vent standard, which is why one pipe covers both the sink trap arm and the sprinkler main. If you are picking between drainage plastics, see PVC vs ABS pipe.

What Is CPVC Pipe?

CPVC is the same base polymer taken through additional chlorination, which raises the temperature it tolerates. It comes in two families. Copper tube size CPVC is made to ASTM D2846, whose components are “intended for water service up to and including 180 °F (82 °C)” and are produced “in one standard dimension ratio.” That is the tan pipe sold as FlowGuard Gold.

The second family is Schedule 40 and Schedule 80 CPVC, covered by ASTM F441, which covers CPVC pipe “made in Schedule 40 and 80 sizes and pressure-rated for water.” That material carries PVC’s dimensions with CPVC’s heat tolerance. Charlotte lists Corzan Schedule 80 for domestic water as well as industrial work, and says FlowGuard Gold is typically installed in 1/2 to 2 inch applications.

PVC vs CPVC: Which One Can Carry Hot Water?

This is the deciding question, and the makers answer it directly. Charlotte Pipe’s plastics technical manual publishes maximum operating temperatures by system: ABS 140°F, PVC 140°F, FlowGuard Gold CPVC copper tube size 180°F, and Corzan CPVC Schedule 80 200°F. Spears’ engineering guide lists the same 140°F for PVC and 200°F for CPVC.

The code sets a hot water bar too. Section 605.4 of Georgia’s plumbing code says hot water distribution pipe and tubing must be rated for at least 100 psi at 180°F. Spears rates its EverTUFF copper tube size CPVC at 100 psi at 180°F, while Charlotte’s manual shows PVC as not rated above 140°F. Charlotte’s own list of typical applications shows distributing potable water inside a building as CPVC only. That is why hot water distribution is CPVC, PEX or copper, and not PVC.

Temperature and Pressure Ratings

Both plastics lose pressure capacity as they warm, and the manual gives correction factors to multiply against the pipe’s rating at 73°F. PVC runs 1.00 at 73°F, 0.62 at 100°F, 0.40 at 120°F and 0.22 at 140°F, and is listed NR — not rated — at every temperature above that. CPVC runs 0.82 at 100°F, 0.65 at 120°F, 0.50 at 140°F, 0.25 at 180°F and 0.20 at 200°F.

Put numbers on it. Charlotte lists 1/2-inch Schedule 40 PVC at 600 psi at 73°F. Apply the manual’s own method at 140°F and that pipe is down to 132 psi (our arithmetic: 600 x 0.22). The pipe has not changed; the duty has. Cold service is where PVC keeps the rating you bought it for.

Spears prints the copper tube size CPVC numbers directly: 400 psi at 73°F, 325 at 100°F, 260 at 120°F, 200 at 140°F, 160 at 160°F and 100 at 180°F, and its PVC and CPVC pipe de-rating factors match Charlotte’s. JM Eagle lists the same 600 psi and 0.840 inch for 1/2 inch Schedule 40 PVC.

Sizing: IPS vs Copper Tube Size

The fittings do not cross over, and the reason is dimensional. Charlotte lists 1/2-inch Schedule 40 PVC at an average outside diameter of 0.840 inch. Half-inch CPVC copper tube size pipe under ASTM D2846 has an average outside diameter of 0.625 inch with a 0.068 inch minimum wall, rated 400 psi at 73°F.

Two pipes both called half inch, two different outside diameters. A PVC socket fitting will not grip CPVC copper tube size pipe, and forcing one on produces a joint with no interference and no bond line. Schedule 40 and 80 CPVC is the exception: it follows iron pipe size dimensions, so it matches PVC’s geometry while keeping CPVC’s temperature rating.

Working with plastic pipe for a living?

Solvent Cement and Primer

Cements are specified separately by material. ASTM D2564 “covers requirements for poly(vinyl chloride) (PVC) solvent cements to be used in joining poly(vinyl chloride) piping systems.” ASTM F493 does the same job for CPVC pipe, tubing and socket fittings. Primers under ASTM F656 are written for PVC pipe joined with D2564 cements.

Charlotte’s cement table matches them up. PVC pipe takes ASTM D2564 clear cement with a primer (ASTM F656). FlowGuard Gold copper tube size CPVC takes ASTM F493 yellow or green medium-bodied cement, with primer optional. Schedule 80 CPVC takes orange heavy-duty cement and an industrial-grade primer. Charlotte adds that all-purpose cement is not recommended for FlowGuard Gold.

Lubrizol’s solvent cement guide lists yellow one-step cements for FlowGuard Gold that need no primer. Its orange cements sit under Corzan CPVC for plumbing, with primer, apart from one orange cut-in and repair cement listed for both FlowGuard Gold and Corzan. The Georgia code (section 605.14.2, in force since January 1, 2026) follows the same colors: orange cement with primer, or a yellow or green one-step cement where the pipe maker allows it without primer.

So PVC cement on CPVC is not a shortcut, it is the wrong product. For new copper tube size FlowGuard Gold joints, the cements Lubrizol lists are the yellow one-step ones. For PVC work the two-step route is primer, then cement. The Weld-On 15900 twin pack pairs the 780 clear PVC cement with a purple primer; the 780 data sheet says it covers all classes and schedules except Schedule 80, through 4 inches.

For copper tube size CPVC the match is a yellow one-step cement such as Weld-On FlowGuard Gold CPVC cement, which its data sheet lists for copper tube size pipe and fittings through 2 inches at up to 180°F.

Whether an inspector wants primer under that joint depends on your adopted code and, for CPVC, on the color of the can, as section 605.14.2 above spells out. We walk through the rule and the exceptions in is purple primer required.

Where Each One Is Used in a House

PVC handles drain, waste and vent lines, the cold side of an irrigation system, pool and equipment piping, and cold water service pipe outside the structure where code permits (Georgia’s Table 605.3 lists PVC for water service). CPVC handles hot and cold potable distribution — the branch lines feeding fixtures and appliances. Running an AC condensate line in either plastic? Charlotte Pipe warns that some refrigerant oils can damage both; see PVC and CPVC condensate drain lines.

One transition detail worth knowing: Charlotte Pipe notes that CPVC can be used with standard brass ferrules for compression connections where the operating temperature will not exceed 140°F, and advises PTFE tape over the ferrule to allow for the different expansion rates of metal and plastic. That is the stop-valve connection under a lavatory, and it is where a lot of CPVC gets damaged.

The same theme applies to threads. Charlotte says to use all-plastic CPVC copper tube size male threaded adapters on cold water only and to use CPVC x brass threaded transition fittings for hot water. Spears says not to thread copper tube size CPVC pipe at all.

Cutting and Working the Two Materials

Both materials cut the same way, which is the one place they overlap cleanly. A ratcheting plastic tubing cutter takes either — the Klein Tools 50063 ratcheting PVC pipe cutter is listed for PVC, CPVC and PEX. The FlowGuard Gold quick reference guide lists ratchet cutters, wheel cutters or a fine-tooth saw for new pipe, says never to use scissor-type cutters, and says not to use ratchet cutters on aged pipe.

Deburr and chamfer the cut end before cementing; a square, chamfered end is what lets cement stay in the joint instead of scraping off on entry. More options in our guide to the best pipe cutters.

PVC or CPVC: Which Should You Buy?

Repairing or extending a drain, vent, irrigation or pool line: PVC, Schedule 40 unless the drawing calls for 80. Repairing or extending a hot or cold water branch inside the house: CPVC copper tube size, matched to whatever is already in the wall. Repiping a whole house from scratch: read PEX vs copper vs CPVC first, which compares all three (and is the page for the CPVC vs PEX question).

The one answer that is never right is mixing them in a supply run because the fittings looked close. They are not close, and the failure shows up as a weep months later rather than at the pressure test.

FAQ

What is the difference between PVC and CPVC? CPVC is PVC that has been chlorinated further, which raises its temperature limit. Charlotte Pipe lists 140°F as the maximum operating temperature for PVC and 180°F for copper tube size CPVC. They also differ in color, outside diameter and solvent cement, and Georgia’s code lists CPVC, not PVC, for water distribution pipe.

Can PVC be used for hot water? No. Charlotte Pipe’s technical manual lists PVC’s maximum operating temperature as 140°F and shows PVC as not rated for pressure above that. Georgia’s code requires hot water distribution pipe to be rated for at least 100 psi at 180°F. Hot water distribution is CPVC, PEX or copper.

Is CPVC pipe the same size as PVC pipe? Not in the residential form. Half-inch copper tube size CPVC has an average outside diameter of 0.625 inch, against 0.840 inch for half-inch Schedule 40 PVC. Schedule 40 and 80 CPVC under ASTM F441 does share PVC’s iron pipe size dimensions.

Can I use PVC cement on CPVC pipe? No. ASTM D2564 cements are specified for PVC piping systems and ASTM F493 cements for CPVC pipe, tubing and fittings. Charlotte Pipe does not recommend all-purpose cement for its FlowGuard Gold CPVC. Match the cement to the material, and check the can lists your pipe size range.

How hot can CPVC get? Copper tube size CPVC components under ASTM D2846 are intended for water service up to and including 180°F. Charlotte Pipe lists 180°F as the maximum operating temperature for FlowGuard Gold CPVC and 200°F for Corzan CPVC Schedule 80, with pressure de-rated at both. Spears rates its copper tube size CPVC at 100 psi at 180°F.

Can you connect PVC to CPVC? Not with a plain coupling. Copper tube size CPVC and PVC have different outside diameters, and the cements are different products. The makers describe transition fittings instead: Spears says its copper tube size CPVC connects to other materials with unions, compression fittings and threaded adapters, and to iron pipe size CPVC with CTS-to-IPS adapters cemented with its two-step CPVC cement and primer. The documents we read do not describe a PVC-to-CPVC solvent joint.

Is CPVC or PVC better for a repair? Neither is better in the abstract. The right one is whatever the existing line is, joined with its own cement. Cutting a CPVC branch and splicing PVC into it produces a joint that cannot bond and a pipe that is not rated for the water going through it.

Bottom Line

PVC is a cold-service and drainage pipe with a published 140°F ceiling, and Georgia’s code does not list it for water distribution. CPVC is a hot and cold distribution pipe rated to 180°F in its copper tube size form. They use different outside diameters, different fittings and different solvent cement, and the only thing they safely share is the cutter. Identify what is already in the wall before you buy anything.

Sources

• ASTM D1785 (maker page: www.astm.org/d1785-21a.html) — Standard Specification for Poly(Vinyl Chloride) (PVC) Plastic Pipe, Schedules 40, 80, and 120 (scope).
• ASTM D2846/D2846M (maker page: www.astm.org/d2846_d2846m-19a.html) — CPVC hot- and cold-water distribution systems (scope, 180 °F service).
• ASTM F441/F441M (maker page: www.astm.org/f0441_f0441m-20.html) — CPVC plastic pipe, Schedules 40 and 80 (scope).
• ASTM D2564 (maker page: www.astm.org/d2564-20.html) and ASTM F493 (maker page: www.astm.org/f0493-20.html) — solvent cements for PVC and for CPVC; ASTM F656 (maker page: www.astm.org/f0656-21.html) — primers.
• Charlotte Pipe Plastics Technical Manual (charlottepipe.com) — maximum operating temperatures and de-rating factors (p. 29), Schedule 40 PVC dimensions (p. 21), CPVC copper tube size dimensions (p. 28), CPVC compression connections (p. 65). Figures read September 2026.
• Spears Plastic Pipe Engineering Guide (parts.spearsmfg.com) and Spears CTS CPVC Technical Guide (spears.com) — PVC and CPVC de-rating factors, 100 psi at 180°F for copper tube size CPVC, transition fittings. Read September 2026.
• JM Eagle PVC Schedule 40/80 data sheet (jmeagle.com) — 1/2 inch Schedule 40 PVC, 0.840 inch outside diameter, 600 psi. Read September 2026.
• Lubrizol solvent cement guide (flowguardgold.com) and FlowGuard Gold installation quick reference (flowguardgold.com) — which cements need primer, cutter advice. IPS Weld-On data sheets for FlowGuard Gold CPVC cement (mtncom.net) (a distributor-hosted copy) and 780 PVC cement. Read September 2026.
• Georgia State Minimum Standard Plumbing Code (2024 IPC with Georgia amendments, in force since January 1, 2026), chapter 6 (up.codes) (UpCodes) — Tables 605.3 and 605.4, section 605.4 (100 psi at 180°F), section 605.14.2 (CPVC solvent cement). Read September 29, 2026.

Related guides

• PVC vs ABS pipe
• PEX vs copper vs CPVC
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• The best pipe cutters
• The best pipe repair clamps