Watts Radiant 81001685 Radiantpex+ Tubing with Evoh Barrier 3/4 Inch 100 Ft Coil Cross-linked Polyethylene

Product Description

The Watts Radiant 81001685 RadiantPEX+ Tubing with EVOH Barrier is a high-performance cross-linked polyethylene pipe designed for radiant floor heating, hydronic heating systems, and potable water distribution. This tubing is built for trade professionals including plumbers, hydronic heating installers, and mechanical contractors who need a reliable, long-lasting solution for in-floor heating loops and closed-loop water systems. The 3/4 inch nominal size coil measures 100 feet in length, giving installers enough material to complete full loops in residential and light commercial radiant heating applications without unnecessary splices or fittings. The tubing has an inside diameter of 0.681 inches and a wall thickness of 0.097 inches, which supports consistent flow rates and pressure performance across the full coil length. The EVOH oxygen barrier layer is a critical feature in hydronic heating systems. It prevents oxygen from permeating through the tubing wall and entering the water circuit. Oxygen infiltration in a closed hydronic loop causes corrosion in boilers, pumps, manifolds, and ferrous components. The EVOH barrier protects the entire system from oxidative damage and extends the service life of all connected equipment. Cross-linked polyethylene, also known as PEX, is the preferred material for radiant heating tubing because it resists high temperatures, handles repeated expansion and contraction cycles, and remains flexible even in tight bending applications. PEX does not corrode, scale, or pit like copper or steel. It is lightweight, easy to handle, and can be run in long continuous coils to minimize connection points. This Watts Radiant tubing is compatible with standard PEX manifolds, crimp fittings, clamp fittings, and press fittings used in radiant and hydronic installations. It meets the demands of both new construction and retrofit hydronic projects.

• EVOH oxygen barrier layer protects hydronic system components from corrosion caused by oxygen permeation
• 100 foot coil length allows full loop installation with minimal joints or splices in radiant floor heating applications
• Cross-linked polyethylene construction resists high temperatures, pressure cycling, and repeated expansion and contraction

Product Highlights

The Watts Radiant 81001685 RadiantPEX+ Tubing delivers reliable performance in radiant floor heating and hydronic systems with its EVOH oxygen barrier and flexible cross-linked polyethylene construction. The 100 foot coil in 3/4 inch nominal size suits a wide range of residential and commercial hydronic heating layouts.

Product Information

Standard Information

• Brand: WATTS RADIANT
• Manufacturer Part Number: 81001685

Technical Specifications

• Nominal Size: 3/4 inch
• Inside Diameter: 0.681 inches
• Outside Diameter: 5/8 inches
• Wall Thickness: 0.097 inches
• Coil Length: 100 feet
• Material: Cross-Linked Polyethylene
• Barrier Type: EVOH Oxygen Barrier