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Peroflex wet system

The optimum hot-water underfloor heating system for new buildings

Just like in a puzzle, where every piece fits seamlessly into the other, creating a coherent picture, the individual work steps for the PEROFLEX system form an optimum underfloor heating system that fulfils all requirements. 

The oxygen-tight heating tube (DIN 4726) is enclosed by DIN 18560 screed around its entire circumference. The gaps between the tube when laying it are defined by the system panels (42 mm thick grid elements consisting of pre-expanded rigid polystyrene foam). 

The edges are shaped so that they fit seamlessly into one other when installed, thereby forming a closed insulating layer. The nubs ensure that the tube is laid accurately and act as an effective support during subsequent work. The result is a perfect underfloor heating system from PEROBE.

As the different assembly options are already given by the system panel, you save time and assembly errors are virtually eliminated. The PEROFLEX system does away with all possible heating tube fixing mechanisms. Neither tube retaining clips nor flat iron bars or reinforcement steel mesh sheets are required. The design of the panels alone makes it possible to save on materials in this way.

The fact that the heating tube is enclosed by screed around its entire circumference represents another advantage. The raised nubs lie above the installed tube and act as an effective support for footboards during subsequent work. The material of the individual grid elements is formed from moulded rigid polystyrene foam (EPS 035). The foamed nubs of the laying elements thereby ensure that the tube is laid accurately. The nubs fix the heating tube in place without the need for additional aids.

The PEROFLEX grid element provides incredible heat insulation and the edge zones of the panels are shaped in such a way that they fit seamlessly into one other when installed, thereby forming a closed insulating layer. This prevents heat and noise bridges from forming as a result of the screed. The design of the grid elements allows for six different tube gap sizes and therefore guarantees optimal performance tailored to different floor sizes.

Technical details

Complete heating system in a wet design:

Ideally suited to new buildings with a construction height of 142 mm (with additional thermal insulation) or 87 mm against heated rooms.


Raw concrete surfaces, concrete floors or wooden floors with structural approval.


Oxygen-tight heating tube to DIN 4726, 10-year warranty.

Peroflex system panel 100/60

W / D / H0.6 m x 1.0 m x 0.042 m

Installation instructions

Step 1:

Roll out the edge insulation strip and place it under the sealing of the door frames to prevent impact noise from being transferred to the walls and to accommodate expansion of the surface covering.

All potential expansion joints are to be discussed with the screed layer prior to the start of installation.

Step 2:

Lay grid elements starting at a wall according to the installation plan / installation direction. Areas not to be heated are to be filled with the supplied filling material. If the ground floor adjoins a foundation slab or a cellar with significantly lower temperatures, an additional layer of thermal insulation and, if necessary, a vapour barrier need to be fitted on-site first!

Step 3:

Lay the oxygen-tight PEROBE heating tube in the sequence of the heating circuits as shown in the installation plan, starting at the manifold and back to the manifold in an endless formation. The tube should be laid without any crossover and the maximum tube length per heating circuit is 120 m.

Step 4:

Attach the heating tube to the manifold using a compression fitting or to the return temperature limiter using adapter unions.

Step 5:

Subject the underfloor heating system to a pressure test and tightness test. When applying the screed, the heating system should remain filled and pressurised. However, it should not be in heating mode.

Step 6:

After quick and straightforward installation of the PEROFLEX underfloor heating system, the cement screed or floating anhydrite screed is applied according to manufacturer specifications. Where applicable, the screed admixture PEROFLEX-ED is to be added to the screed.

Step 7:

Warm up the screed as specified by the screed manufacturer and draw up a heating report (PEROBE template available as a PDF file).

Connection layout

The system is connected and regulated via return temperature limiters for smaller areas and via heating circuit manifolds, room thermostats and zone valves in all other cases.

List of parts


Buy directly

You can order this product and other Perobe products from our online shop.