Pipe Material Comparison Tool: Copper, PEX, Steel, CPVC

How to Use the Pipe Material Comparison Tool

1

Filter to Relevant Materials

Click a pill to remove a material from the table, or click again to add it back. Narrow the comparison to the options actually under consideration for your project.

2

Compare the Properties That Matter Most

Roughness coefficient feeds directly into the Hazen-Williams calculator and Darcy-Weisbach calculator. Thermal expansion feeds the pipe expansion calculator. Use whichever property matters most for the decision in front of you.

3

Check the Scorecards for a Quick Summary

Each material's scorecard below the table gives a condensed view of its key numbers and best-use case, useful for a quick decision without reading the full table.

Choosing the Right Pipe Material for the Job

There is no single best pipe material for every hydronic, refrigerant, or hot water application. Each material trades off cost, temperature range, installation speed, and code acceptance differently, and the right choice depends on the specific application, not a universal ranking. This comparison brings the key decision-making numbers together in one place so you do not need to look them up separately across multiple references.

Copper: The Established Standard

Type L copper is the default for exposed hydronic heating and cooling piping in Canadian mechanical rooms, with a wall thickness that handles typical system pressures comfortably. Type K, with an even thicker wall, mostly appears in underground or below-slab service entrances where extra physical protection matters more than cost. Copper handles higher temperatures than PEX or CPVC, which matters for systems running well above typical hydronic temperatures. Run pipe sizing for copper on the pipe sizing calculator using its standard Hazen-Williams roughness coefficient of 150. Copper's higher upfront cost is often offset by a longer service life, a tradeoff worth running through the lifecycle cost calculator when comparing materials on more than sticker price alone.

ACR Copper: A Different Standard Entirely

ACR copper tubing looks similar to plumbing copper but is cleaned, dehydrated, and capped to a completely different standard specifically for refrigerant and air conditioning use, governed by ASTM B280, the standard specification for copper tube used in air conditioning and refrigeration field service. Plumbing-grade Type L or K copper is never an acceptable substitute for refrigerant lines, since it lacks this cleaning process and can introduce moisture and oxide scale that contaminate a sealed refrigerant circuit. Always size refrigerant lines on the dedicated refrigerant line sizing calculator rather than treating ACR copper like hydronic copper.

PEX: Speed and Flexibility

PEX tubing installs faster than rigid copper since it bends around obstacles without extra fittings, which also reduces the number of potential leak points in a concealed run. Its lower maximum temperature rating and higher thermal expansion coefficient than copper are the main tradeoffs, along with a maximum pressure rating that varies by manufacturer and needs checking against the specific product. PEX is the common choice for radiant floor loops, which the radiant floor pipe calculator sizes specifically. Code acceptance for PEX varies more by jurisdiction than copper does, so a quick check against the NBC compliance checker is worth doing before specifying it on a project outside familiar territory.

CPVC: A Middle Ground

CPVC handles higher temperatures than standard PVC and costs less than copper, making it a sometimes-used middle option for domestic hot water distribution. It has a notably higher thermal expansion coefficient than copper or steel, which the pipe expansion calculator accounts for directly, so long exposed CPVC runs need more attention to expansion provisions than the same length of copper.

Steel: The Choice for Larger Mains

Steel Schedule 40 pipe becomes more cost-competitive than copper at larger diameters and is common in commercial boiler rooms and large distribution mains. It has a lower Hazen-Williams roughness coefficient than copper or PEX, meaning more friction loss at the same flow and size, and that roughness coefficient drops further as the pipe ages and develops interior scale, a factor the Hazen-Williams calculator's adjustable C value is built to capture for older systems.

A Note on Cost and Code

Relative cost figures in this comparison are general industry positioning, not current material pricing, which fluctuates with commodity markets and should always be confirmed with a current supplier quote. Code acceptance for any material should be confirmed against the current CSA B214 installation code for hydronic heating systems, registered with the Standards Council of Canada, and the specific provincial or municipal requirements for your project, since acceptance can vary by application and jurisdiction.

Frequently Asked Questions

PEX costs less and installs faster since it bends around obstacles without extra fittings, while copper handles higher temperatures and has a longer track record in exposed mechanical room piping. For radiant floor loops and concealed runs, PEX is the common choice. For exposed boiler room piping and any system running above PEX's temperature rating, copper remains the standard.

Plumbing-grade copper, whether Type L or Type K, is not cleaned and capped to the standard refrigerant systems require, so it can introduce moisture and oxide scale that contaminate refrigerant and oil. ACR copper tubing is cleaned, dehydrated, and sealed specifically for refrigerant and air conditioning use, and Canadian mechanical codes and most manufacturer warranties require it for refrigerant piping.

Steel's interior surface is naturally rougher than drawn copper or extruded plastic at the time of manufacture, and it roughens further over time as mineral scale and corrosion products build up on the interior wall. This is reflected in a lower Hazen-Williams C value, meaning more friction loss at the same flow rate and pipe size, which is why steel pipe sizing calculations often need a larger diameter than an equivalent copper or PEX system for the same flow.

The general material properties shown here, like roughness and thermal expansion, apply similarly to potable water applications, but potable water systems have additional code requirements around lead content, certification, and approved fittings that this comparison does not cover. Confirm potable water specific requirements separately from the hydronic and refrigerant focus of this comparison.