Schlüter®-DITRA-HEAT | Installation | Schlüter-Systems



The system may only be installed by a certified electrician (EN 60335-1). This heating cable must feature a multi-pole circuit breaker with a contact clearance of at least 3 mm per pole. To protect against inadvertent contact, an RCD (FI circuit breaker) with a tripping current of IΔN ≤ 30 mA must be installed. Further information about installing the heating cables and installing and setting the thermostat is included in the instructions supplied with the heating cables or the thermostat.

Positioning the floor sensor

Variant A: The floor sensors are positioned directly in the newly installed uncoupling membrane Schlüter®-DITRA-HEAT. Since the floor sensors are directly embedded in the adhesive and cannot be replaced, the installation should include a spare sensor is to be included in the installation (a second sensor is included with the thermostat as a spare). The sensors must be installed centrally between two heating cable loops.

Variant B: The thermostat floor sensor is positioned in the conduit with the sensor sleeve directly in the floor underneath the uncoupling membrane Schlüter®-DITRAHEAT. Make a cutout in the uncoupling membrane Schlüter®-DITRA-HEAT in the area of the sensor sleeve. Insert the sensor into the conduit and then slide the sleeve over it (conduit and sensor sleeve are included in the installation set Art. No. DH EZ S1). To guarantee optimum temperature transfer from the area to be heated to the sensor, no insulation material (e.g. Schlüter®-DITRA-HEAT-DUO) should be located between the sensor sleeve and DITRA-HEAT. In this case, a cutout for the sensor sleeve should be made in the insulation.

Note: Prior to embedding the sensors in the adhesive, measure the resistance values, for example with the cable tester Schlüter®- DITRA-HEAT-E-CT, and compare them to the values listed in the thermostat instructions.

  1. The substrate must be level, weight-bearing, and free of any substances that may weaken the bond. All levelling work must be completed prior to installing Schlüter®-DITRA-HEAT.
  2. The adhesive used for installing Schlüter®-DITRA-HEAT must be selected to suit the substrate type. The adhesive must bond well with the substrate and mechanically set in the anchoring fleece of Schlüter®-DITRAHEAT. Check for any incompatibilities of materials.
    It is therefore advantageous to prepare the thin-set mortar in a fluid-bed consistency. Check for any incompatibilities of materials. If using covering materials with a lateral length ≥ 30 cm, we recommend a water-binding tile adhesive for rapid curing and drying of the mortar.
  3. Apply a suitable adhesive on the substrate with a notched trowel (6 x 6 mm). To achieve a better initial bond for adhesion in wall areas, we recommend applying a contact layer on the backside of DITRA-HEAT.
  4. Cut pieces of Schlüter®-DITRA-HEAT to size and fully embed the anchoring fleece in the applied adhesive. Immediately press the material into the adhesive with a float or a roller, working in a single direction. The curing times of all materials must be observed. When installing materials from a roll, it is best to align Schlüter®-DITRA-HEAT with light tension at the time of positioning the material.
  5. To prevent damage or detachment from the substrate, it is recommended to use timber boards (especially in the centre of the assembly for material transport) to protect the installed Schlüter®-DITRA- HEAT membrane from mechanical impact.
  6. Installation of heating cables
    6a. The heating cables can be installed immediately after adhering the DITRA- HEAT uncoupling membrane, using a float or roller. In the case of wall installation, the heating cables are installed once an adequate adhesive bond has been achieved. Heating cables may not touch or cross one another.
    6b. Prepare a groove in the area of the soldered cable end.

    Note: The cable tester Schlüter®-DITRA- HEAT-E-CT is designed to measure and verify the resistance of the electrical heating cables Schlüter®- DITRA-HEAT-HK during the entire installation phase. An acoustic signal will sound to alert the installer in the event of damage.

    Floor areas:
  7. The stud spacing of the uncoupling membrane is 3 cm. Spacing in floor areas must be at least • 9 cm (installation around every 3rd stud–equivalent of 136 W/m²); spacing may not be closer Closer spacing, especially in floor areas, may result in overheating and damage to building structures. Make sure not to step on heating cables during the installation work.

    Wall areas:
  8. Depending on the available space, the desired surface temperature and the required heating output, the installation spacing in wall areas can either be • 6 cm (around every second stud– equivalent of 200 W/m²) or • 9 cm (around every third stud– equivalent of 136 W/m²).
  9. The transition from the heating cable to the connection cable (sleeve) is labeled with an imprint as shown. The sleeve also features a “Connection” label. The imprint “COLD” is shown in the further course of the connection cable. This thermistor (4 m) must be connected directly to the junction box or thermostat. The thermistor (sensor) can be shortened to max. 1.00 meter in front of the sleeve, but heating cables may not be cut to size.
  10. Once the heating cables have been installed and tested in accordance with the Schlüter®-DITRA-HEAT-E installation instructions, tiles can be installed, using an adhesive that meets the requirements of the covering. It is helpful to fill the grooves of the uncoupling membrane in a single step, using the smooth side of the notched trowel (heating cables and sleeves must be fully embedded in tile adhesive) and to then use the notched side to prepare the adhesive for the tile or stone. To ensure full embedding in the adhesive, choose a notched trowel to match the tile format. The curing times of the adhesive must be observed.
  11. Please observe the instructions regarding movement joints as perimeter, edge and connection joints in this product data sheet.


The adhesive and the covering materials used in conjunction with Schlüter®- DITRA-HEAT must be suitable for the corresponding application and meet the applicable requirements. The first heating of Schlüter®-DITRA-HEAT may not occur any earlier than 7 days after completion of the covering assembly.

Waterproofing with Schlüter®-DITRA-HEAT

Provided the panel joints and the connections to built-in elements and upright structural fixtures are carefully sealed, Schlüter®- DITRA-HEAT can be used to create a certified bonded waterproofing assembly with the tile covering.

Schlüter®-DITRA-HEAT features the national technical approval (abP) required in Germany and bears the Ü mark. Moisture exposure class according to abP: 0 - B0 und A. Schlüter®-DITRA-HEAT has the required European Technical Assessment (ETA) as specified in ETAG 022 (bonded waterproofing assemblies) and bears CE marking. Moisture exposure class according to ETAG 022: A.

Exclusively use system-approved adhesives for areas that require CE conformity or compliance with the German general certificate of national technical approval (abP). Please contact us at the address shown in this data sheet for further information about suitable adhesives and the corresponding test certificates.

Accordingly, Schlüter®-DITRA-HEAT protects the substrate from damage resulting from permeating moisture and aggressive substances. Cover abutting joints with the sealing adhesive Schlüter®-KERDI-COLL-L and full embed the sealing bands Schlüter®- KERDI-KEBA (minimum width: 12.5 cm). To waterproof floor/wall transitions, adhere Schlüter®-KERDI-KEBA to Schlüter® DITRA- HEAT in floor areas and directly to the substrate in wall areas, using the corresponding widths. The sealing bands should have at least 5 cm of coverage. Schlüter®- KERDI-KEBA is also suitable for creating functional connections to fixed structural elements such as door or window elements made of metal, wood, or plastic. As a first step, apply Schlüter®-KERDI-FIX to the corresponding areas of the structural elements. Then fully embed the remaining width fully over Schlüter®-DITRA-HEAT, using the adhesive Schlüter®-KERDI-COLL. The suitability of Schlüter®-KERDI-FIX for the material of the structural elements must be verified in each case. Separate Schlüter®-DITRAHEAT above existing movement joints or structural joints and cover the abutting joints with Schlüter®-KERDI-FLEX. Heating cables may not cross expansion joints or dummy joints. Schlüter®-KERDI-FLEX is also recommended for flexible finishing edges. As an alternative, you can also use Schlüter®- KERDI-KEBA with a corresponding loop.

Note regarding floor drains:

Schlüter®-KERDI-DRAIN and Schlüter®- KERDI-LINE are components that were specifically developed for connection to bonded waterproofing assemblies. Schlüter®-DITRA-HEAT can be quickly and reliably connected in these cases with the use of Schlüter®-KERDI collars.


The system heating cables of Schlüter®- DITRA-HEAT-E may only be operated with Schlüter®-DITRA-HEAT-E thermostats.

Contact Schlüter-Systems Ltd

Units 3-5 Bardon 22,
Beveridge Lane, Coalville,
Leicestershire, LE67 1TE
Phone: +44 (0) 1530 813396

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