This Is How It Works: DIY Retrofitting Wall Heating with Clay Plaster

Installation instructions

To demonstrate the simple installation of the FLEXIRO wall heating for plastering, we have carried out a test installation of approximately 2 m². The most important installation steps are described in the illustrated installation procedure. Detailed installation instructions can be downloaded at the bottom of the page and are included with each heating kit.

The FLEXIRO wall heating for plastering contains all the components required to retrofit existing wall surfaces as panel heating and to integrate the heating surfaces into the existing heating system. Suitable plaster materials for wall heating are Gypsum plaster, lime plaster and clay plaster and must be purchased separately.

The 10 mm PE-RT heating pipes are quickly and neatly laid on the wall in the previously installed pipe support honeycomb elements. The installation and connection of the wall heating to the existing heating system is simplified by the use of plug-in connections and RTL boxes, making FLEXIRO equally suitable for DIY enthusiasts.

Installing wall heating using the plastering method

Planning of the installation
Installation check
Completion of wall heating

To conclude

Despite the simple design of the wall heating system and the ease of installation, we must point out that, as the manufacturer, we can only guarantee correct delivery from the factory and not installation and connection by third parties. Please also observe the current standards and regulations for heating systems.

FLEXIRO wishes you every success with the implementation of your project!



For the FLEXIRO wall heating dry construction, a standard gypsum plasterboard 12 mm thick is used. For damp rooms, dry construction recommends an impregnated gypsum plasterboard GKBI. Please ask for a customised offer.

Yes, the FLEXIRO wall heating can be mounted on an exterior wall. However, the exterior wall should have a maximum U-value of 0.30 W/m2K. If insulation is installed behind the wall heating to minimise heat loss to the outside, a building physics check of the construction may be required to prevent condensation in the wall when the wall heating is not in operation. During operating, the wall heating will dry-heat the affected wall rather than causing moisture damage to the construction.

After installing the drywall panels, you can visualise the arrangement of the heating pipes in heating mode with a thermal imaging camera. The pipes have a distance of 100 mm. In this way, pictures can also be hung later. Alternatively, if the walls are not tiled, you can spray them slightly damp when the heating is on. Where a heating pipe runs, the moisture will dry off more quickly.