ARDEX FLEXBONE Electric Radiant Floor Heating Kit with UH 905 Heating Uncoupling Membrane, Heat Cable (Heating Wire), Thermostat, and Safe Installation Tools

Product Features:

• Flexible Voltage Options: ARDEX FLEXBONE HEAT kit available in both 120V and 240V heating cable options, with multiple length variations to accommodate any room size or layout, or project type.
• Premium German Engineering: Premium German design and engineering, UL-certified for safety and reliability, ensuring efficient energy consumption and long-term performance in residential and commercial applications.
• Heat Uncoupling Membrane: Includes ARDEX FLEXBONE HEAT uncoupling membrane with a crossbone stud pattern for full mortar embedding around the heating cable, helping increase heating efficiency.
• Floor Stability Protection: ARDEX FLEXBONE HEAT uncoupling membrane is 1/4" (6 mm) thick, providing superior load distribution, waterproofing, and anti-fracture protection for enhanced floor durability and stability.
• Wide Flooring Compatibility: Ideal for ceramic tile, porcelain tile, marble tile, granite tile, and natural stone tile installations, providing durable protection, waterproofing, and uncoupling performance while ensuring even heat distribution across the entire floor surface.
• Advanced Touchscreen Thermostat: Comes with the ARDEX FLEXBONE thermostat, 120/240V, with built-in GFCI protection and an intuitive 3.5 in. color touchscreen for easy temperature control and scheduling.
• Dual Temperature Sensors: Equipped with dual temperature sensors for precise floor and ambient readings, ensuring consistent radiant heat across the entire heated area.
• Electric Fault Detection: Electric fault indicator immediately detects and alerts if the heating cable or floor system is damaged, preventing costly reinstallation.
• Installation U-Notch Trowel: Suntouch U-notch plastic trowel included to simplify cable installation and protect heating wires during thin-set mortar adhesive application.
• Complete Heated Floor Kit: Complete under-tile radiant heated floor system—everything needed for a safe, effective, and easy-to-install heated floor solution.
• Comprehensive Warranty Coverage: Backed by a 10-year system warranty and a 3-year thermostat warranty for long-term reliability and peace of mind.

Product Description:

This ARDEX FLEXBONE Electric Radiant Floor Heating Kit is a complete in-floor heating system that includes all essential components for a seamless installation. Engineered in Germany, it is designed to create an efficient and durable heated floor, offering a radiant heating solution that delivers maximum warmth, comfort, efficiency, performance, and reliability. This superior quality kit provides a comprehensive solution for achieving warm, comfortable floors, featuring excellent uncoupling and waterproofing capabilities as compared to traditional heated floor mats.

It includes a thermostat, energy-efficient heating cable, uncoupling heating membrane, electric fault detector, and installation accessories, all designed to work together to deliver consistent, even heat beneath tile, stone, and other manufacturer-approved floor coverings such as vinyl, LVP, laminate and hardwood. Ideal for use in bedrooms, living and dining rooms, bathrooms, kitchens, laundry rooms, entryways, lobbies, hallways, foyers, basements, garage conversions, enclosed balconies, home gyms, hot yoga studios, showers, and commercial spaces such as restaurants, hotels, and other interior spaces where infloor heating is required and both comfort and efficiency matter most.

ARDEX FLEXBONE HEAT membrane provides outstanding vapor management, waterproof protection, and uncoupling performance for both residential and commercial projects. It offers crack prevention by neutralizing stress between substrates and tile coverings, helping avoid grout joint and tile damage, while eliminating the need for the use of additional liquid-applied crack isolation membranes or anti-fracture membranes down the road. It also ensures long-lasting adhesion and a stable, damage-resistant radiant floor heating system.

The ARDEX FLEXBONE HEAT Membrane incorporates a unique crossbone stud pattern that securely holds the heating cable in place, allowing full thin-set mortar embedding in a single pass to optimize heat transfer and efficiency. It helps eliminate cold spots and uneven temperature zones by minimizing air gaps between the heating wire and the uncoupling layer, ensuring uniform heat distribution across the tiled surface. The design creates fewer touchpoints between the heating wire and the membrane, maximizing energy transfer and reducing thermal loss, resulting in efficient and consistent heating across the entire floor surface.

This advanced structure also acts as a crack-isolation barrier, protecting tiles from substrate movement while providing complete waterproofing. Its durable, textured top surface absorbs substrate movement and prevents cracks from transferring to the tile finish. The uncoupling membrane effectively compensates for thermal expansion and contraction, ensuring superior load distribution and stress relief across the entire surface. With minimal roll memory, the UH 900 membrane lies flat instantly upon unrolling, preventing curling or bunching and ensuring ease of handling during layout and installation, making it ideal for any home improvement project. Additionally, it provides a smooth transition and compatibility with surrounding flooring such as engineered hardwood, luxury vinyl planks (LVP), rigid-core flooring. As a suitable underlayment for laminate flooring, UH900 ensures durable protection and a flush finish suitable for integrated designs in custom homes.

Whether you're tiling over a plywood subfloor, OSB, concrete slab, cement backer board, gypsum substrate, or existing tiled surfaces, the ARDEX UH 900 FLEXBONE uncoupling floor heating membrane delivers exceptional load distribution and stress-relief performance. It reduces the risk of tile delamination, cracked grout lines, and structural movement damage over time by reducing grout stress from the substrate below and protecting your floor tiles and tile coverings in both residential and commercial tile installation projects. Please note that it's highly recommended to overlap all joint lines using the ARDEX TLT 711 Polyethylene Vapor Retardant Waterproofing Seam Tape. Applicable for both residential and commercial usage.

Chemically resistant and impervious to moisture, it is ideal for wet areas such as bathtub surrounds and hot tub surrounds. The system supports a wide variety of floor finishes and types, including large format tile, thin porcelain tile, polished marble tile, onyx tile, glass tile, ceramic tile, mosaic tile, travertine tile, quartzite tile, granite tile, natural stone tile, cement tile, concrete, and vinyl. It ensures lasting protection and even heat distribution.

This crack-resistant radiant floor heating system delivers rapid heat response, superior thermal conductivity, and exceptional long-term durability for reliable comfort and performance. It also works seamlessly with high-performance polymer-modified mortars such as ARDEX X 78, ARDEX X 77, ARDEX X 32, ARDEX X 7 R, ARDEX X 5, ARDEX X 4 and ARDEX X 3 PLUS, ensuring optimal bond strength and reliability. Whether you're remodeling a modern spa bathroom or upgrading a kitchen with heated tile floors, the ARDEX FLEXBONE HEAT kit is the trusted choice for professional projects and a perfect solution for radiant floor heating and tile installation, outperforming heated bathroom floor mats thanks to its advanced uncoupling membrane's properties.

The FLEXBONE thermostat offers advanced features such as adaptive temperature control, programmable schedules, energy usage tracking, and an easy-to-navigate setup wizard. The integrated GFCI protection ensures user safety, while the thermostat's sleek 3.5-inch color touchscreen makes it simple to customize temperature settings. It handles a resistive load of up to 15 amps, delivering powerful heating performance while maintaining efficiency.

The heat cable utilizes innovative FEP insulation resistant to up to 401 °F (205 °C) and features aluminum shielding that guarantees zero electromagnetic interference (EMF). Designed to reduce energy consumption by up to 11 %, the system provides consistent warmth with lower power usage. Each cable maintains uniform thickness for a secure fit into the ARDEX FLEXBONE uncoupling membrane, ensuring a quick and straightforward installation.

Whether you're installing a new heated tile floor or upgrading an existing one, this Made in Germany electric radiant heating system provides the perfect balance of comfort, energy efficiency, and durability, making it an excellent choice for any modern home or renovation project. The DIY-friendly design allows for easy positioning and installation, reducing labor time while ensuring professional-grade results. Radiant heated floor system installation offers an energy-efficient and modern alternative to traditional floor heaters, providing consistent warmth and comfort throughout your space. Professionals say that a high-quality radiant heat kit like ARDEX FLEXBONE is the best electric heater for bathroom, kitchen and garage floors.

Whether used in a new build or renovation, the ARDEX Heat Kit offers long-term durability, preserving the integrity of tile and stone surfaces for years to come. Available in convenient sizes to suit any project, it is an excellent solution for flooring installations requiring maximum stability, moisture control, and efficiency. Designed with precision-engineered German technology, this high-performance membrane underlayment system combines electric floor heating compatibility with crack-suppression and anti-fracture properties of uncoupling membrane to protect expensive tiles, making it a top choice for tile contractors and DIY professionals alike.

Choosing the Right ARDEX Mortar for Installing ARDEX UH 900 FLEXBONE Heat Membrane

ARDEX recommends using polymer‑modified tile and stone mortars with a designation of ISO 13007 C2, or mortars that comply with ANSI A 118.4, A 118.11, or A 118.15 standards.

For best results, ARDEX’s own mortars—such as ARDEX S 28™ MICROTEC® Rapid‑Set, Rapid‑Dry Super‑Format Tile and Uncoupling Membrane Mortar, ARDEX X 78, ARDEX X 77 MICROTEC Fiber‑Reinforced Tile and Stone Mortar, ARDEX X 32, ARDEX X 7 R, ARDEX X 5 Flexible Tile and Stone Mortar, ARDEX X 4 and ARDEX X 3 PLUS—are all approved for installing both the membrane to the substrate and tiles over the membrane.

The membrane should be installed over the substrate using a 1/4” x 1/4” (6 x 6 mm) notched trowel to ensure proper coverage and bond strength with an approved ARDEX mortar. The mortar thickness between the membrane and the tile must be a minimum of 1/8” (3 mm) and should not exceed 3/8” (9 mm). Additionally, approved ARDEX self‑leveling underlayments may be used as a prefill option to fully encase the heating cables in one step, offering a faster, more efficient installation method.