PEX Tubing

PEX Tubing is the flexible material used in Radiant Heat and Hydronic Heating Systems. Hot water passes through the PEX and warms the room. An oxygen barrier is typically required.

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PEX (Poly Ethylene X-Linked) Tubing is a flexible material that has revolutionized the heating industry. With PEX Tubing, radiant heat can be installed in virtually any home to provide the comfort of warm floors. PEX Pipe (or PEX Tubing) for radiant heat is flexible enough to create loops in your floors with minimal connections, durable enough to last for the lifetime of your home, and affordable enough to install today!

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FAQs

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  • Which type of PEX tubing is best for a standard radiant heat job?

    If by standard you mean a closed system, with cast iron pumps, valves and a boiler, then oxygen barrier PEX is the right tubing for you. Brands of oxygen barrier PEX include hePEX, ThermaPEX, HydroPEX, and Viega PEX.

  • Which brand of PEX Tubing is the best?

    Wirsbo hePEX and ThermaPEX tubing are both PEX-a products. PEX-a uses is made using the best manufacturing process (the Engel method) and produces the strongest, most flexible tubing. PEX-a tubing is also the only tubing that can be used with expander style fittings. hePEX is more expensive than ThermaPEX because it is made by Wirsbo (Uponor), the leading brand name, who have been the world leader in PEX for decades. The other brands of PEX, HydroPEX and Viega PEX, are comparable and can be used in standard radiant applications. All of these brands carry at least a 20 year warranty.

  • What installation methods are available for PEX?

    There are many different ways to install PEX tubing in a radiant heat system. The most popular are in a slab, in joist bays with aluminum panels or PEX clips, or in a Quik Trak above subfloor system. The most efficient and least expensive way to install PEX is an in-slab application; but unfortunately this option is not always available.

  • Which size of PEX is most commonly used for radiant heat?

    1/2" is by far the most common size of tubing used in radiant heat. 5/8", 3/8", and 3/4" follow behind. The size of PEX tubing used does not change the amount of heat that is produced, but it does change the maximum loop length that can be run.

  • How far apart should I space the PEX tubing for my radiant job?

    The spacing of PEX tubing in a radiant heat system determines how much heat a given area will produce. This spacing or distance between two PEX lines is also referred to as the on-center distance. The closer that tubing is spaced, the higher the BTU output will be, given that water temperature is held constant. When laying out your tubing you must keep this in mind. For basements and shops, 12" spacing will work. For living areas, tubing can be spaced roughly 9" apart. For a bathroom, tubing can be 6-7" apart. This spacing assumes a moderate climate; if you are located in a warm climate tubing can be spaced farther apart and if you are located in an extremely cold climate tubing should be spaced closer together. Along exposed walls, tubing should be spaced 6" apart for the first 2-3' to combat the heat loss.

  • Which tubing is best to use for hydronic heating applications such as baseboard?

    For baseboard and other hydronic heating applications you will want to use either oxygen barrier PEX or PEX-AL-PEX tubing (the aluminum core acts an oxygen barrier). In most applications oxygen barrier PEX (such as ThermaPEX or hePEX) will be used. However, PEX-AL-PEX, because of its ability to hold its shape, is often used. Both of these products are able to withstand temperatures up to 200° F. The oxygen barrier will prevent rusting of cast iron components in your system.

  • What is PEX-AL-PEX Tubing used for?

    PEX-AL-PEX tubing is used in some slab applications, Warmboard applications, and in some hydronic heating jobs. The main advantage of using PEX-AL-PEX is its ability to hold its shape when bent or pushed a certain way. This can be great in tight situations such as in the boiler room and for baseboard. However, for in slab and joist applications this tubing can be difficult to work with. PEX-AL-PEX can is great for high temperature systems as well because it has a very low expansion rate of .156" per 100 feet for a 10° temperature rise.

  • Can PEX Tubing be used for a solar system?

    No, you cannot use PEX on a solar system because the water temperatures in a solar system can reach 325°, which is too high for PEX.

Try using our Radiant Heat Calculator to find out what materials you need for your job.

Need more help finding what you need?

1-888-757-4774 Monday - Thursday:
8am to 5:45pm
Friday:
9am to 4:45pm

Comparison Guide

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Radiant Heat PEX Tubing Compatability Chart

  hePEX ThermaPEX Rifeng ViegaPEX Mr. PEX-al-PEX FostaPEX Tubing Onix
Type Oxygen Barrier Oxygen Barrier Oxygen Barrier Oxygen Barrier PEX-AL-PEX PEX-AL-PEX Non-PEX
Rating PEX-a PEX-a PEX-b PEX-b PEX-b PEX-b N/A
Compatible Fitting Styles Clamp Clamp Clamp Clamp PEX-AL-PEX Compression PEX-AL-PEX Compression Onix Style
Crimp Crimp Crimp Crimp Viega Press
Viega Press Viega Press Viega Press Viega Press
Compression Compression Compression Compression
Sharkbite Sharkbite Sharkbite Sharkbite
Wirsbo Expander Wirsbo Expander
ASTM Rating ASTM F876/7 ASTM F876/7 ASTM F876/7 ASTM F876/7 ASTM F1281 ASTM F876/7 ASTM-Approved
Max Temp / Pressure Rating 200° at 80psi 200° at 80psi 180° at 100psi 200° at 80psi 200° at 100psi 180° at 100psi 180° at 100psi
Warranty in Years 25 25 20 25 25 25 25

Max Loop Length Chart

Size Max Loop Length
5/16" 250 ft.
3/8" 250 ft.
1/2" 300 ft.
5/8" 400 ft.
3/4" 500 ft.
1" 750 ft.

PEX Tubing Size Chart

Size Inside Diameter (In.) Outside Diameter (In.)
5/16" 0.292 0.43
3/8" 0.35 0.5
1/2" 0.475 0.625
5/8" 0.574 0.75
3/4" 0.671 0.875
1" 0.862 1.125

PEX Tubing Minimum Bend Radius

PEX Size ID OD Minimum Bend Radius*
3/8" 0.350" 0.500" (1/2") 3"
1/2" 0.475" 0.625" (5/8") 3.75"
5/8" 0.574" 0.750 (3/4") 4.5"
3/4" 0.671" 0.875" (7/8") 5.25"
1" 0.862" 1.125" (1-1/8") 6.75"

*Minimum bend radius equals 6-times the outside diameter

70 products shown

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  • 3/8" Oxygen Barrier PEX Tubing (600 ft Coil) View Specs
    • SKU: 038-600-OXY
    • Brand: Rifeng

    $143.95 / each

    In Stock! (66 Available) Ships in 24-48 Hrs
  • 3/8" Oxygen Barrier PEX Tubing (1,000 ft Coil) View Specs
    • SKU: 038-1000-OXY
    • Brand: Rifeng

    $239.95 / each

    In Stock! (61 Available) Ships in 24-48 Hrs
  • 1/2" Oxygen Barrier PEX Tubing (300 ft Coil) View Specs
    • SKU: 050-300-OXY
    • Brand: Rifeng

    $99.95 / each

    $284.85 / box
    3 x $94.95

    In Stock! (228 Available) Ships in 24-48 Hrs
  • 1/2" Oxygen Barrier PEX Tubing (1,000 ft Coil) View Specs
    • SKU: 050-1000-OXY
    • Brand: Rifeng

    $289.95 / each

    $1,115.80 / box
    4 x $278.95

    In Stock! (524 Available) Ships in 24-48 Hrs
  • 5/8" Oxygen Barrier PEX Tubing (400 ft Coil) View Specs
    • SKU: 062-400-OXY
    • Brand: Rifeng

    $147.95 / each

    In Stock! (57 Available) Ships in 24-48 Hrs
  • 5/8" Oxygen Barrier PEX Tubing (1,000 ft Coil) View Specs
    • SKU: 062-1000-OXY
    • Brand: Rifeng

    $454.95 / each

    In Stock! (17 Available) Ships in 24-48 Hrs
  • 3/4" Oxygen Barrier PEX Tubing (300 ft Coil) View Specs
    • SKU: 075-300-OXY
    • Brand: Rifeng

    $135.85 / each

    $519.80 / box
    4 x $129.95

    In Stock! (20 Available) Ships in 24-48 Hrs
  • 1" Oxygen Barrier PEX Tubing - 300 ft Coil View Specs
    • SKU: 100-300-OXY
    • Brand: Rifeng

    $194.95 / each

    In Stock! (46 Available) Ships in 24-48 Hrs
  • 3/8" MR. PEX Oxygen Barrier PEX Tubing - (600 ft. coil) View Specs

    $249.65 / each

    $485.90 / box
    2 x $242.95

    In Stock! (16 Available) Ships in 24-48 Hrs
  • 1/2" Mr. PEX Oxygen Barrier PEX Tubing - (300 ft. coil) View Specs

    $139.65 / each

    $407.85 / box
    3 x $135.95

    In Stock! (269 Available) Ships in 24-48 Hrs
  • 1/2" Mr. PEX Oxygen Barrier PEX Tubing - (500 ft. coil) View Specs

    $239.65 / each

    $461.90 / box
    2 x $230.95

    In Stock! (26 Available) Ships in 24-48 Hrs
  • 1/2" Mr. PEX Oxygen Barrier PEX Tubing - (1000 ft. coil) View Specs

    $469.95 / each

    $899.30 / box
    2 x $449.65

    In Stock! (36 Available) Ships in 24-48 Hrs
  • 1/2" Mr. PEX Oxygen Barrier PEX Tubing - (1200 ft. coil) View Specs

    $559.95 / each

    $1,077.90 / box
    2 x $538.95

    In Stock! (36 Available) Ships in 24-48 Hrs
  • 3/4" Mr. PEX Oxygen Barrier PEX Tubing - (300 ft. coil) View Specs

    $243.95 / each

    $469.90 / box
    2 x $234.95

    In Stock! (39 Available) Ships in 24-48 Hrs
  • 3/4" Mr. PEX Oxygen Barrier PEX Tubing - (500 ft. coil) View Specs

    $405.95 / each

    $779.90 / box
    2 x $389.95

    In Stock! (14 Available) Ships in 24-48 Hrs
  • 5/8" Mr. PEX Oxygen Barrier PEX Tubing - (330 ft. coil) View Specs

    $199.95 / each

    $385.90 / box
    2 x $192.95

    In Stock! (30 Available) Ships in 24-48 Hrs
  • 5/8" Mr. PEX Oxygen Barrier PEX Tubing - (1000 ft. coil) View Specs

    $609.95 / each

    $1,171.90 / box
    2 x $585.95

    In Stock! (6 Available) Ships in 24-48 Hrs
  • 1" Mr. PEX Oxygen Barrier PEX Tubing - (300 ft. coil) View Specs

    $419.95 / each

    $807.90 / box
    2 x $403.95

    In Stock! (14 Available) Ships in 24-48 Hrs
  • 1" Mr. PEX Oxygen Barrier PEX Tubing - (100 ft. coil) View Specs

    $140.95 / each

    $271.90 / box
    2 x $135.95

    In Stock! (39 Available) Ships in 24-48 Hrs
  • 3/4" Mr. PEX Oxygen Barrier PEX Tubing - (100 ft. coil) View Specs

    $81.95 / each

    $157.50 / box
    2 x $78.75

    In Stock! (45 Available) Ships in 24-48 Hrs

More About PEX Tubing For Heating

PEX (cross-linked polyethylene) tubing is a flexible pipe used in radiant heat and hydronic heating systems. Radiant heat is growing in popularity, and is now the preferred heating system in new homes. Radiant heat provides more comfort throughout the home than standard baseboard heat. PEX tubing is installed beneath the floor and heats the home from the ground up. As the floor becomes warm, the room is heated evenly and efficiently. Radiant heat is silent, producing no creaking, banging, or humming sounds that are commonly heard in other heating systems. Radiant heat allows you to turn the thermostat a few degrees lower than you normally would while providing the same warmth. This cuts energy bills and saves you money.

PEX tubing is approved by all major plumbing/heating codes and bends easily, making it more versatile than standard copper tubing. Manufacturers of PEX generally provide a 20-25 year warranty, but PEX is known to have a much longer lifespan. 1/2" PEX is the most common size used in radiant heat, but 3/8", 5/8", and 3/4" are also available.

Types of Radiant Heat Tubing

Oxygen Barrier PEX
The "barrier" referred to in PEX tubing is an oxygen barrier. The oxygen barrier assures that no oxygen will enter the heating system. A standard radiant heat system is a closed system that includes cast iron pumps, valves, and a boiler. This type of system requires an oxygen barrier PEX to prevent the cast iron components from rusting over time. If oxygen barrier tubing is not used, components in the system should be brass, bronze, or stainless steel which are more expensive. We offer several types of oxygen barrier PEX including Uponor (Wirsbo) hePEX, ThermaPEX , Rifeng, and Viega PEX.

PEX-AL-PEX
PEX-AL-PEX (PEX-Aluminum-PEX) is a three-layer oxygen barrier PEX Tubing. The main benefit of PEX-AL-PEX is that it maintains its shape when bent. While traditional PEX is flexible, it returns to its original shape when left unsecure. Once bent, PEX-AL-PEX will hold that shape until bent again. PEX-AL-PEX has less expansion capacity than standard PEX. PEX-AL-PEX is generally used in outdoor heating applications, warmboard systems, and high temperature systems such as baseboard or fan coils. We carry several types of PEX-AL-PEX including Rifeng PEX-AL-PEX, Uponor (Wirsbo) Multicor, and Viega FostaPEX.