Products > HEATING > Modular floor heating > Technical


Technology and installation

This is how floor heating is constructed using drywall construction

If you want to retrofit floor heating, install the VarioComp floor heating system. All components in this complete drywall construction system are perfectly matched:

  • The specially milled routings on the VarioComp panels
  • The easy to bend VarioProFile pipe with an extremely stable form (aluminium multi-layer composite pipe)
  • The fast-drying VarioComp filling compound
  • The height of the optional XPS and Silent underlay panels


1.  Substructure
2.  VarioComp panel 600 x 1000 mm
3.  VarioProFile pipe 11.6 x 1.5 Laser
4.  VarioComp filling compound
5.  Floor covering

Die 20 mm dünne Fußbodenheizung von Variotherm ist optimal für die Heizungssanierung und kann auf bestehende Böden verlegt werden.

VarioProFile-Pipe 11,6 x 1,5 Laser – the aluminium multi-layer composite pipe

Das Alu-Mehrschichtverbundrohr von Variotherm verbindet die Vorteile des Kunststoffes und des Aluminiums. Viele Vorteile = ein Rohr!

The VarioProFile pipe uses the advantages of both aluminium and plastic. It combines five interconnected layers. That guarantees a slightly flexible yet dimensionally stable pipe.

The innermost layer is made of polyethylene and extremely temperature resistant. The inner surface is smooth as glass, making it impossible for deposits to form. The water flows through the pipe without resistance and with minimal pressure losses.

The profiled surface structure increases the outermost layer of the pipe by up to 15%. The larger surface means optimised heat transfer compared with other pipes with the same diameter. >>> more

Tested and certified

In addition, the complete system, which has been tested and proven in practice, has been awarded a number of quality certificates.

Variotherm wurde von Quality Austria auch als Österreichischer Musterbetrieb ausgezeichnet. Dieses Zertifikat dient als Bestätigung für außerordentliche Leistungen und Qualität.
Viele Variotherm Produkte mit CE-Kennzeichnung: vom Ökoheizputz über die Kompaktfüllmasse bis hin zu Trittschalldämmplatten. Und vieles mehr ...
Die MFPA Leipzig, die Gesellschaft für Materialforschung, hat die Trittschalldämmung der Variotherm-Produkte „XPS-Platte 10-200“ und "VarioNop11" geprüft und bescheinigt.

Quick reaction times

The VarioComp surface heats up far more quickly than equivalent wet screed floor heating systems. A comparative test shows that the VarioComp surface heats up 2.5 hours faster than the screed floor system. And cools down faster avoiding overheated rooms.

Comparative measurement

1 Heating water temperature
2 Modular Floor heating system VarioComp surface temperature
3 Screed floor heating system surface temperature
4 Short reaction time when the heating system is switched on and off

Prerequisites as a suitable substructure

The subsurface must be dry, dust-free and grease-free:

1. Dry

The subsurface must be dry, dust-free and grease-free. Maximum residual humidity of the subsurface (CM values):

  • Untreated concrete: 3.0 %
  • Cement screed: 2.0 %
  • Calcium sulphate screed: 0.5 %

2. Level

The required evenness is as follows (ÖNORM DIN 18 202):

3. Load-bearing

It must be ensured that there is a load-bearing capacity pursuant to ÖNORM EN 1991-1-1.

Pipe spacing and piping

The VarioComp panels can be laid with the following pipe spacings:

  • 100 mm pipe spacing: Living rooms and barefoot areas – this way it’s comfortably warm.
  • 150 mm pipe spacing: For example in workshops, shed spaces, offices, etc. – for all rooms where we don’t walk barefoot.

The VarioProfile pipe 11.6x1.5 (aluminium multi-layer composite pipe) can be laid in bifilar or meander form. 

The maximum pipe length per heating circuit including supply pipe is 80m. 100 mm pipe spacing requires 10 m/m². If the heating pipe is laid with 150 mm spacing, you need to allow for 6.7 m/m².

Laying example

This is how the floor heating can be installed using drywall construction: example of a family house where the heating pipe was laid continuously with 100 mm pipe spacing.

The peripheral zone starting in front of a large glass surface or glass doors, a meander pattern layout goes along the glass surface, reaching into the room by about 1¬metre. This will lead to a higher surface temperature in front of the glass surfaces (Variotherm comfort tip).

Ideal floor coverings for floor heating

The surface of the VarioComp floor heating system complies with ÖNORM DIN 18202.

You can lay whichever floor covering you like, whether it’s stone, wood, laminate and multi-layer parquet, ceramic tiles, linoleum or carpet. It’s important that the floor covering is suitable, according to the manufacturer’s information. 

In general, the thicker the covering, the slower the heat transfer, since the floor has to be heated up for longer. For example, tiles and natural stone have a high thermal conductivity and quickly radiate heat into the room. 

The floors should have a maximum thermal resistance of 0.15 m²K/W. Variotherm’s recommendation: ≤ 0.1 m²K/W.

Simple and quick to install

The 18 millimetre-thin gypsum fibre boards are laid on a flat and load-bearing substructure using drywall construction. These VarioComp panels have specially milled routings. This enables the VarioProFile pipe 11.6x1.5 (aluminium multi-layer composite pipe) to be laid individually. This guarantees even pipe spacing. At the same time, the pipe is firmly fixed between the routings. The heating pipe can be laid in meander or bifilar form. 

Finally, the special VarioComp filling compound is poured on and levelled. The floor covering can already be laid after a short drying period (after around 24 hours). Any surface is possible: wooden parquet, tiles, stone flooring, laminate or carpet.

Die VarioKomp, die Fußbodenheizung im Trockenbau ist rasch und einfach verlegt. Das Heizungsrohr kann bifilar oder mäander verlegt werden.


Die speziell gefrästen Noppen der Kompakt-Platten gewährleisten das flotter Verlegen mit exaktem Rohrabstand von 10 cm.
The specially milled routings in the VarioComp panel guarantee fast laying
Die Kompakt-Platte für die VarioKomp Fußbodenheizung im Trockenbau ist ab jetzt auch mit einem Rohrabstand von 150 mm erhältlich.
The VarioComp panel with 150 mm pipe spacing for closets.
The VarioProFile pipe of Variotherm. Extremely stable form and yet easy to bend
The VarioProFile pipe. Extremely stable form and yet easy to bend
Durch den hohen Trittschalldämmwert, reduziert die Trittschalldämmung SILENT die Schallübertragung über den Fußboden.
SILENT impact sound insulation reduces sound transmission via the floor.
Die XPS-Platte aus Polystyrol-Hartschaum ist eine Wärmedämmplatte und kann direkt unter der Gipsfaserplatte eingesetzt werden.
Thermal insulation panel made of polystyrene rigid foam
Der Randdämmstreifen entkoppelt den Schall und beugt Rissen vor.
Edge insulation strips 75 mm
Ein Heiz- und Kühlkreisverteiler reguliert die Durchflussmengen des Wassers und verteilt dieses gleichmäßig in den Flächenheiz- und Kühlsystemen.
VarioManifold 5.0: Variotherm heating and cooling manifold
Pumpenverteilerstation 5.0 zur Kombination von Niedertemperatur-Flächenheizungen und Hochtemperatur-Heizungsanlagen
Pumped VarioManifold 5.0 for installing surface heating systems in high-temperature heating systems
Pump microstation. The distribution manifold solution for individual rooms
Die Kompakt-Füllmasse wurde eigens zum Ausfüllen der fertig verlegten Variotherm Kompakt-Platten entwickelt.
VarioComp filling compound for filling out the laid VarioComp panels with inserted VarioProFile piping
Der elektronische Raumthermostat TOUCH HK regelt die Raumtemperatur beim Heizen und Kühlen per Fingerdruck.
The TOUCH HK room thermostat regulates the temperature quickly and easily