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DIY Retrofit Low Profile Underfloor Heating

Thermal comfort of underfloor heating for existing and old buildings

Our low profile underfloor heating achieves a minimum installation height of 17 mm. The flat construction also allows retrofitting to existing floor surfaces.

Central component of our all-in-one DIY heating kits is a high quality, 10 mm thin PE-RT composite pipe. It is oxygen tight, temperature resistant and flexible to install. RTL technology ensures safe operation even with conventional heating systems with high flow temperatures.

The water-bearing underfloor heating system is connected between the flow and return of the heating system in the same way as a conventional radiator. Existing radiators are either replaced or, as with towel radiators in the bathroom, operated in conjunction with the radiant heating system.

Our DIY kit is designed for retrofitting heating surfaces of up to 10 m². For larger areas, multiple sets can be combined and connected to the heating system via RTL boxes. Low-tool installation, special plug-in connections and detailed installation instructions and videos make it extremely easy to lay the thin underfloor heating system.

Upgrade individual rooms such as the living room or bathroom with low profile underfloor heating. Bring the thermal comfort of FLEXIRO into your home.

O.FR.10
introductory price -10%
Low profile underfloor heating - control unit
Underfloor Heating Kit with Clip Rails - Components for 2.5 sqm
Underfloor Heating Kit with Clip Rails - Components for 5sqm
Underfloor Heating Kit with Clip Rails - Components for 7.5sqm
Underfloor Heating Kit with Clip Rails - Components for 10sqm
Underfloor Heating Kit with Knobbed Mats - Components for 2.5sqm
Underfloor Heating Kit with Knobbed Mats - Components for 5sqm
Underfloor Heating Kit with Knobbed Mats - Components for 7.5sqm
Underfloor Heating Kit with Knobbed Mats - Components for 10sqm
Underfloor Heating Kit 2,5sqm with Clip Rails and Multibox
Underfloor Heating Kit 5sqm with Clip Rails and Multibox
Underfloor Heating Kit 7.5sqm with Clip Rails and Multibox
Underfloor Heating Kit 10sqm with Clip Rails and Multibox
Underfloor Heating Kit 2.5sqm with Knobbed Plates and Multibox
Underfloor Heating Kit 5sqm with Knobbed Plates and Multibox
Underfloor Heating Kit 7.5sqm with Knobbed Plates and Multibox
Underfloor Heating Kit 10sqm with Knobbed Plates and Multibox

Underfloor Heating Kits

from 1 € 239.99 Incl. 19.00% VAT + shipping costs
from 1 € 239.99 Incl. 19.00% VAT + shipping costs
from 1 € 314.99 Incl. 19.00% VAT + shipping costs
from 1 € 379.99 Incl. 19.00% VAT + shipping costs
from 1 € 439.99 Incl. 19.00% VAT + shipping costs
from 1 € 324.99 Incl. 19.00% VAT + shipping costs
from 1 € 449.99 Incl. 19.00% VAT + shipping costs
from 1 € 579.99 Incl. 19.00% VAT + shipping costs
from 1 € 659.99 Incl. 19.00% VAT + shipping costs
from 1 € 289.99 Incl. 19.00% VAT + shipping costs
from 1 € 364.99 Incl. 19.00% VAT + shipping costs
from 1 € 429.99 Incl. 19.00% VAT + shipping costs
from 1 € 489.99 Incl. 19.00% VAT + shipping costs
from 1 € 374.99 Incl. 19.00% VAT + shipping costs
from 1 € 509.99 Incl. 19.00% VAT + shipping costs
from 1 € 629.99 Incl. 19.00% VAT + shipping costs
from 1 € 709.99 Incl. 19.00% VAT + shipping costs
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Article no.: O.FR.10

Article no.: O.FR.10.1.R

Article no.: O.FR.10.2.R

Article no.: O.FR.10.3.R

Article no.: O.FR.10.4.R

Article no.: O.FR.NP.10.1.R

Article no.: O.FR.NP.10.2.R

Article no.: O.FR.NP.10.3.R

Article no.: O.FR.NP.10.4.R

Article no.: O.FR.10.1.M

Article no.: O.FR.10.2.M

Article no.: O.FR.10.3.M

Article no.: O.FR.10.4.M

Article no.: O.FR.NP.10.1.M

Article no.: O.FR.NP.10.2.M

Article no.: O.FR.NP.10.3.M

Article no.: O.FR.NP.10.4.M

Other Products

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For structural calculations in the run-up to a house modernisation, it is sometimes necessary to know how much weight the underfloor heating will put on a floor. Of course, the weight depends on the individual floor structure and the materials used. Nevertheless, the weight of the FLEXIRO components can be calculated. The majority of the additional weight is attributable to the levelling compound. The specific weight of a levelling compound is typically between 1.6 and 1.8 kg/m² per 1 mm layer thickness. With a construction height of 17 mm, an estimated weight of approx. 26 kg/m² can be expected. The underfloor heating itself adds only approx. 1.9–2.2 kg/m², even when filled with water. Therefore, the thin-layer system is much lighter than a standard underfloor heating system where the heating screed must be included in the calculation.

The minimum coverage for the heating pipes is 3 mm. However, the required layer thickness depends on the flooring material selected. The minimum layer thickness is only recommended for tiles and ceramic materials. Other flooring materials require an additional 5 mm of coverage. The levelling compound must be flexible and bear the manufacturer's mark indicating suitability for thin-layer underfloor heating. To ensure optimum heating and cooling performance, apply the levelling compound as thinly as possible. Further information on the thermal resistance of standard floor coverings can be found in our underfloor heating data sheet.

Definitely not. The FLEXIRO underfloor heating system is designed precisely for this application. The diffusion-tight 10 mm PE-RT heating pipe minimises the risk of corrosion in the existing heating system. The RTL control boxes prevent high hot water temperatures, which can be a problem for the underfloor heating circuits, by limiting the return temperature. Radiators and underfloor heating can be safely combined in mixed operation with this technology.

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FLEXIRO meets the Trusted Shops quality criteria

  • Certified since 2013
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  • More than 300 positive reviews

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