sub banner

Schluter Systems

Schluter Systems

Schluter®-Systems develops products specifically for the tile industry to ensure that installations maintain integrity and durability. The Schluter product line includes tile trims, uncoupling membranes, floor heating systems, waterproof building panels, and shower systems.

For more detailed information on any of their products it is highly recommended to go to their Web Site to see all of what they offer and they have plenty of instructions and information.

Schluter Systems
Installation of Schluter®-DITRA-HEAT membrane and heating cable

Heating Cables


  • Before installing and operating this product, the user and/or installer must read, understand and follow these instructions and keep them handy for future reference.
  • If these instructions are not followed, the warranty will be considered null and void and the manufacturer deems no further responsibility for this product.
  • The following instructions must be adhered to in order to avoid personal injuries or property damages, serious injuries and potentially fatal electric shocks.
  • This product must be installed by a qualified person in accordance with this installation handbook and with the National Electric Code (U.S.) as applicable. All electric connections must be made by a qualified electrician, according to the electrical and building codes effective in your region.
  • A dedicated circuit is required for each application.
  • Ground fault equipment protection (i.e., GFCI) is required for each circuit (included in the DITRA-HEAT thermostats).
  • Never install a cable designed for a 120 V power source on a 240/208 V power source.
  • This cable must be grounded.
  • Mark the appropriate circuit breaker reference label indicating which branch circuit supplies the circuit to the floor warming heating cable system.
  • De-energize all power circuits before installation and servicing.
  • Very important: Never CUT the heating cable. This would change the cable resistance and could lead to a fire.
  • Heating cables shall not be altered in the field. If the installer or the user modifies the unit, he will be held responsible for any damage resulting from this modification, and the warranty and the product certification will be void.
  • The heating section of the cable must be entirely installed under the floor covering. The installation is characterized as a Type C (Embedded Floor Warming) application. In order to prevent a fire hazard, do not install it anywhere else (e.g. in a wall).
  • Do not run the heating cable under a wall, from one room to another; an individual cable must not heat more than one room.
  • Never install the heating cable under vanities, bathtub platforms, kitchen cabinets and islands or any other fixtures. Excessive heat will build up in these confined spaces and may cause a fire.
  • Never use the heating cable for any purpose other than heating a floor INSIDE a building.
  • Always keep a 3 stud (3-1/2") spacing between cable runs. A narrower spacing may cause a fire or damage the floor covering. A wider spacing may not provide sufficient power to warm the floor.
  • Heating cables may not touch, cross over, or overlap one another.
  • Minimum spacing from walls or fixtures (e.g., cabinets) is 3".
  • Minimum spacing from other heat sources (baseboard heaters, fireplaces, forced air heating ducts, etc.) is 8".
  • Minimum spacing from any plumbing drain is 6".
  • It is helpful to plan the location of a buffer zone, as it is not possible to predict where the heating cable will end. The buffer zone is an area where heating is not essential, typically behind a toilet or adjacent to a door opening. This area allows for placement of excess heating cable.
  • Heating cable testing is required while the heating cable is on the spool and at two subsequent steps during installation to ensure cable quality and for warranty purposes. A megohmmeter is required for the insulation resistance testing of the heating cables.
  • Never energize the cable while it is on the spool. This would lead to overheating that could damage the cable and may cause a fire.
  • The minimum temperature at which the cable should be installed is 32° F.
  • Avoid folding the heating cable on itself, a radius of curvature less than 0.0625 inch could damage its sheath.
  • The minimum installed bending radius of the heating cable is 0.5 inches.

To avoid damaging the DITRA-HEAT-E-HK heating cable spool due to handling, we recommend turning the box over to remove the spool from the packaging box. Then pick up the spool from underneath the heating cable coil, but not by the cardboard washers.

Heating Cable Tests
Schluter Systems Schluter Systems Test 1: Conductor resistance test
In order to perform the resistance test, you must set your multimeter for resistance measurement and take an ohms reading between the two power leads. If the ohms reading taken on the two power leads varies significantly (10% or more) from the value printed on the spool, it either means that the cable has been damaged, or that the measuring instrument is not set properly, or that it is simply out of calibration. The ohms measurement must be recorded in your heating cable tests log.
Schluter Systems Schluter Systems Test 2: Continuity between the braid and the two conductors
The heating cable is protected by a ground braid. An electrical insulator prevents any contact between the braid and the two conductors. To make sure there is no contact between the braid and the two conductors, you must perform a continuity test. Using the continuity test (buzzer logo) function of your multimeter, test your cable between the braid and one of the two power leads. If there is no continuity (if the test is successful), the multimeter will display, depending on the instrument used, either “OL ” for “over load” or “I” for “infinity”. Otherwise, if the test fails, neither “OL ”, nor “I” will be displayed and a warning tone will be heard. The test result must be recorded in your heating cable tests log.
Schluter Systems Schluter Systems Test 3: Insulation resistance test
This test is meant to detect very small breaks throughout the cable insulation. These breaks often remain undetected during the continuity test since they are not necessarily short circuits between the conductor and the ground braid. Even though they are small, these breaks are likely to cause a current leakage to ground. Such a leakage is usually detected by the mandatory ground-fault circuit interrupter “GFCI” (thermostat with integrated GFCI or panel mount GFCI). When a current leakage is detected, the GFCI trips the circuit, thus disabling the floor heating system. In order to perform the insulation resistance test, you must, using a megohmeter (Mohm logo), take an insulation measurement between the braid and one of the two power leads. Make sure the megohmeter range is set at 1000 V. The insulation resistance measurement must be equal to or greater than 1 Gigaohms (1 Gigaohms = 1 G ohms = 1000 M ohms = 1000 Mega ohms). The insulation resistance measurement must be recorded in your heating cable tests log.

Installing Cable Page 2

Installing Membrane


43.1 sq. ft.



Schluter Systems
Kit includes: 5 pc 3'3" x 2'7" Uncoupling Membrane (43.1 sq.ft)
88.2' Heating Cable
1 - White Digital Programmable Thermostat.
Use Schluter's Calculator Page for help with figuring what you need

60.3 sq. ft.



Schluter Systems
Kit includes: 7 pc 3'3" x 2'7" Uncoupling Membrane (60.3 sq.ft)
124.1' Heating Cable
1 - White Digital Programmable Thermostat.
Use Schluter's Calculator Page for help with figuring what you need

Schluter Systems



The DITRA-HEAT membrane is designed to secure the system heating cables and serves as a universal substrate for tile coverings. Similar to DITRA, the original uncoupling membrane, DITRA-HEAT provides uncoupling to neutralize the differential movement stresses between the substrate and the tile covering to prevent cracked grout and tile, waterproofing to protect moisture-sensitive substrates, vapor management, and support.

Heating Cable

The twisted pair heating cable is available in 120 and 240 Volt formats. The cables can be installed without returning to the thermostat and produce virtually no electromagnetic fields.

Digital Thermostat

The digital thermostat controls the floor temperature and is offered in both a programmable and non-programmable format. The thermostats feature a built-in Ground Fault Circuit Interrupter (GFCI), digital display with backlit screen, and support both the 120 and 240 Volt cables. The programmable thermostat also includes 250 preset programs.

Various KERDI waterproofing accessories are available. Use KERDI-BAND to seal butt joints or corner joints. KERDI-KERECK pre-formed seamless inside and outside corners and KERDI-SEAL-PS for sealing around pipes or KERDI-SEAL-MV seals mixing valve protrusions, and KERDI-DRAIN Assemblies. KERDI-TROWEL also available for installation of thin-set mortar.

Schluter Menu

Wall and Backsplash Tile
ARDEX Products
Bostik Grout
Miracle Sealants

Fox Home Page
Receive a copy of our
current advertising flyer by mail!