FlextraPipe is the latest generation of the proven FlexPipe – flexible pre-insulated pipe systems. The main differences are that the flexibility is three times better, and the built-in diffusion barrier preserves the full insulation property (lambda of 0.023 W/mK)​ for the pipe's entire service life. The ideal solution for domestic heating networks and district heating branch pipes.

FlextraPipe brochure​

Preinsulated pipe system – three times as flexible

FlextraPipe's preinsulated pipe system is three times as flexible, making it incredibly flexible. We have achieved this unique flexibility by optimising the geometry of the corrugated casing and the formula of our PUR foam. Tests in the field and the laboratory show that it requires much less force to bend FlextraPipe than the traditional FlexPipe.

Graphs showing flexural properties

Built-in diffusion barrier

The corrugated outer casing has a built-in diffusion barrier (EVOH) to preserve the insulation property throughout the entire service life of the FlextraPipe system. This helps ensure the lowest possible heat loss and hence the lowest possible operating costs and CO2 emissions for the pipe system.

Use our LOGSTOR Calculator to calculate the heat loss and CO2 emissions.

Rupture strength and ovality tests at DTI

FlextraPipe passed DTI's laboratory test without reservation. The test was performed on AluFlextra TwinPipe, 20-20/110 mm in diameter with a flexure of 10*d.The result confirms that the pipes withstand flexure without rupturing.

Link to DTI test report

Different pipes, different applications

FlextraPipe is a fixed, preinsulated pipe system. It is available with three different types of carrier pipe, insulated with soft polyurethane (PUR) and a protective high density polyethylene (HDPE) casing. These products are called PexFlextra, AluFlextra and SaniFlextra. They fulfil varying requirements and have been designed for various operating temperatures and pressures.


The carrier pipe in PexFlextra is made of very flexible polyethylene (PEX) with an exterior EVOH diffusion barrier which prevents oxygen entering the district heating water.​ It is available as single or double pipe. PexFlextra is recommended for pipe sections where continuous operating temperature and pressure do not exceed 85 °C and 6 bar.

PexFlextra brochure


AluFlextra has an aluminium carrier pipe with an internal PEX lining and external PE coating. This sandwich construction exploits the advantages of the plastic's smooth surface and the metal's collapse resistance. AluFlextra prevents the penetration of oxygen into the district heating water and the diffusion of water vapour into the insulation foam. The maximum permitted continuous operating parameters for AluFlextra are 90​°C and 10 bar.

AluFlextra brochure


Tools and fittings

FlextraPipe systems are all compatible. They include all the necessary joints, fittings and tools to build a complete pipe network. This makes installation fast, easy and fault-free, and reduces installation and wage costs to a minimum.

Prefabricated T-piece

The carrier pipe in the new prefabricated T-piece is made of steel. Despite this, it is compatible with any FlextraPipe system, as the necessary pressure connectors are installed at the factory. The T-piece is therefore ready for quick and easy installation on site.

Ideal for domestic heating projects

There is no clear distinction between district and domestic heating. The latter refers to small-scale local heating networks with a number of connected buildings and homes, heated from central energy sources.

Domestic heating projects are implemented locally, in locations where there is no access to district heating. They are based on small units with a typical heat capacity ranging from 50 kW to a few megawatts. Hot water for heating can be transported at relatively low temperature.

It is a highly flexible form of heating supply, as virtually any fuel can be used. Several plants can also produce energy for the same network.

Energy sources for domestic heating projects are often sustainable, such as biogas and biomass (woodchips, wood pellets, straw etc). However, fossil fuels can also be used.

Significant environmental benefits can be achieved by using local energy sources which would otherwise go to waste, such as straw, wood chips, waste heat from industrial plant or biogas – rather than oil fired boilers, electric heat pumps, etc.

The operating costs and hence the price of the heat are also reduced significantly.

Flexibility and high insulation makes LOGSTOR FlextraPipe perfect for domestic heating projects, given the diversity of buildings, landscapes and other local conditions which the pipe section has to be routed through.

FlextraPipe brochure

FlexPipe brochure