PEX Tubing is a cross-linked polyethylene pipe manufactured using extrusion method. PEX pipe is cost-effective, flexible, durable and easy to install, making it a popular choice vs. copper and CPVC piping.
Oxygen Barrier and PEX-AL-PEX tubing are intended for heating applications (radiant floor heat, baseboards, etc.)
Non-Barrier PEX is intended for hot and cold domestic water use.
FREE SHIPPING ON ALL PEX TUBING.
- Connection Systems
- Standards & Approvals
- Questions & Answers
|Size||ID||OD||Wall Thickness||Min. Bend Radius||Recommended Circuit Length||Max. Circuit Length||Water volume gal/100ft||Pipe weight lbs/100ft|
100 psi @ 180°F
160 psi @ 74°F
Required to ensure complete system integrity and leak-free performance. Test duration is generally no less than 2 hours. For heating systems, 40 psi minimum or at least x3 times the operating pressure is recommended. For hot & cold water plumbing systems, x1.5 is recommended. In both instances, the testing pressure should not exceed 100 psi. Slight variations in readings may occur due to natural expansion/contraction of PEX with temperature changes.
Typical water temperatures in floor hating applications
140°F for radiant floor heat applications in concrete, gypsum or other thermal mass slabs (both structural/reinforced and non-structural/non-reinforced).
160°F for installations of PEX under the subfloor between the joists. As low as 140°F with heat transfer plates. Consult with flooring manufacturer to ensure compatibility.
Up to 180°F for hydronic heating installations with baseboards or radiators.
Connection SystemsTable 1. Connection systems compatibility chart – by Type
|Crimp System||Clamp System||Push-To-Connect System||Press System||Expansion System||Compression Fittings|
Crimp and clamp systems utilize brass or poly crimp style fittings and copper crimp rings or stainless steel cinch clamps. These are the most common and widely available connection systems in the USA.
Push-to-connect fittings (also known as Push-Fit or Quick-Connect) are removable type fittings which do not require a tool. Common brands include SharkBite (Cash Acme), TecTite (Elkhart), Pro-Connect (Webstone Valves) and others.
Press system uses stainless steel sleeves and a special press tool. Originally developed by Viega.
Expansion system is a proprietary connection system from Uponor (formerly Wirsbo).
Compression fittings consist of an insert, a split compression ring and a compression nut. This method requires adjustable pliers or crescent wrench to complete the connection.
Table 2. Connection systems compatibility chart – by Brand:
|Everhot PEX||Compatible with (Mfr/Brand)||Not compatible with|
|Barrier & Non-Barrier PEX pipe||Zurn (ZurnPEX)
Watts (RadiantPEX, RadiantPEX+, WaterPEX)
Nibco (DuraPEX, BarrierPEX)
Cash Acme (Sharkbite)
and most others.
Other proprietary systems
|PEX-AL-PEX||Watts (Radiant PEX-AL)
|Other proprietary systems|
Standards & ApprovalsAll standards, approvals and certifications below are for Everhot PEX products only.
Certifications & Approvals
|Type||Heating Applications||Plumbing (Potable Water) Applications|
|Oxygen Barrier PEX||Yes - NSF/ANSI 14, nsf-rfh||No|
|Non-Barrier PEX||Yes*||Yes - NSF/ANSI 61 Annex G (nsf-pw-g), NSF/ANSI 372, NSF P171, AB1953|
|PEX-AL-PEX||Yes - NSF/ANSI 14, nsf-rfh||Yes - NSF/ANSI 61 Annex G (nsf-pw-g), NSF/ANSI 372, NSF P171, AB1953|
Everhot Non-Barrier PEX piping is fully in compliance with 2014 SDWA “lead-free” regulations and is approved for residential and commercial potable water use, including municipal chlorinated water.
Everhot Oxygen Barrier PEX tubing is approved for heating applications only.
All Everhot PEX is certified to the UPC (Uniform Plumbing Code).
|Oxygen Barrier PEX||ASTM F876/F877, CSA B137.5, DIN 4726|
|Non-Barrier PEX||ASTM F876/F877/F2023, CSA B137.5|
|PEX-AL-PEX||ASTM F1281, CSA B137.10|
Frequently Asked Questions
Q: What’s the difference between oxygen barrier and non-barrier PEX?
A: Oxygen barrier type PEX pipe has an external polymer coating called EVOH or “oxygen diffusion barrier” and it’s the type used for all standard closed loop heating applications, including floor heating, baseboard/radiator heating and snow melting. Non-barrier PEX has no additional coatings and is the type used for hot and cold water plumbing applications, as well as for open-loop heating systems.
Q: What’s the difference between open and closed loop systems?
A: A closed loop heating system contains water which circulates in a closed loop without mixing with fresh water or being exposed to the atmosphere. In a closed loop system, water is heated by a boiler (or similar), pumped to the floor heating system (or baseboards/radiators), then returns back to the boiler and the cycle repeats. Such systems often contain cast iron parts (boilers’ heating elements, pumps, etc.) and therefore would require PEX with O2 barrier.
An open loop heating system often utilizes the domestic hot water from a water heater or a storage tank and therefore has high oxygen content, which would require that the system’s components are either stainless steel, bronze or brass. Such systems do not require an O2 barrier and can use the non-barrier type PEX.
Q: Can I use PEX for solar applications?
A: No. Temperatures in solar systems often far exceed the 180°F rating of the PEX tube and would require either copper or corrugated steel pipes.
Q: Which size PEX tubing should I use?
A: For residential radiant floor heat installations, 1/2" PEX tubing is most common. For commercial, sizes up to 3/4" (and even 1" in some cases) can be used depending on the project size. For baseboards, 5/8" or 3/4" PEX are recommended, although very small baseboards can be fed with 1/2" PEX lines. For cast iron and aluminum radiators, 3/4" PEX is a standard size.
In small to mid size residential plumbing 3/4" PEX is used for mains and 1/2" for feeding water to the fixtures. In larger size homes, 1" size is sometimes used for main water lines.
Q: What’s the recommended spacing of PEX in a floor heating system?
A: When attaching to the subfloor between the joists with 16" OC spacing, 1/2" PEX is spaced at ~8" apart. For most other installations, including thin slabs over plywood, basements and structural (wire mesh or rebar reinforced) concrete slabs, the spacing is usually 10-12". The numbers above are typical for well insulated structures and may vary depending on local climate and temperature of water in the heating system.
Q: Does PEX color make a difference?
A: No. Tubing comes in different colors to help distinguish between hot and cold water lines with red and blue colored pipes respectively.
Q: Can I use Everhot PEX pipe with a different brand tools and fittings?
A: Yes, Everhot PEX tubing is compatible with majority of the tool and fitting brands sold in the US, including Watts, Viega, Nibco, Zurn and many others. See “Connection Systems” tab for compatibility details.
Q: Can PEX pipe be used for installation of an outdoor wood boiler or furnace?
A: Yes. 1" oxygen barrier PEX is most common for the job. For non-pressurized boilers, PEX piping without O2 barrier can be used.
Different types of PEX tubing
Non-Barrier or “Plumbing” PEXThis is the standard PEX type used in plumbing systems for hot and cold water distribution. Plumbing PEX tubing usually comes in red and blue colors to help installer distinguish between the hot and cold water piping. This type is not suitable for traditional closed-loop heating applications.
PEX with O2 (Oxygen) BarrierHas an external coating of EVOH polymer, which creates a barrier around the pipe, preventing permeation of oxygen into water through the pipes’ walls and prevents decomposition of cast iron elements and formation of rust. This type is used strictly for heating applications and is not suitable for potable water plumbing.
PEX-AL-PEX tubingA composite type pipe comprised of 3 layers - PEX, aluminum and PEX bonded together. This is the only PEX type which exhibits “memory” properties and keeps the shape it was bent to. Smaller diameters can be used with pre-manufactured plywood panels; larger – for wood boiler and furnace lines.
Advantages of PEX
PEX in PlumbingOne of the most important and distinctive advantages of PEX tubing over traditional copper plumbing is its cost. A typical 3/4" size “L” type copper pipe runs today for about $2.00/ft, whereas PEX is less than $0.50/ft, which is a four times difference in price.
Unlike rigid copper, brass and CPVC pipes, PEX is flexible and requires a fraction of the quantity of fittings used in rigid pipe installations, which further reduces material costs, produces more pressure at the fixture and significantly cuts installation time.
Due to the nature of PEX piping, it expands and contracts more then copper and brass pipes and is able to absorb more thermal stress produced by changes in water temperature. As a result, PEX has more resistance to bursting from water freezing inside the pipes and eliminates the issue of “singing pipes”.
PEX in HeatingThere are no good alternatives to PEX tubing in the radiant floor heating industry. Warm floor systems are more efficient than all other types of heating systems and produce the highest comfort level available.
In hydronic baseboard and radiator systems, PEX tube can easily replace copper pipes with less material costs and installation time.
While most PEX manufacturers only offer 20-25 year warranty, the expected lifespan of the pipe is estimated to be around 50 years, as long as it’s properly installed, kept away from sunlight and used within approved temperature and pressure ranges.