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Flexalen 600 single line

​The flexible choice
Flexalen 600 single line pre-insulated pipe
Flexalen 600 single line pre-insulated pipe
Flexalen 600 single line pre-insulated pipe
Flexalen 600 single line pre-insulated pipe

Flexalen 600 single line has been developed as a highly practical solution for district heating, cooling and potable water networks of any scale. As the most flexible pre-insulated pipe system on the market, network implementation is achieved in no time and at minimal hassle, while ensuring durable performance over a long lifetime.

High flexibility to minimize installation time and cost

The high flexibility of our Flexalen pre-insulated single line allows for highly efficient network implementation:

  • Optimal routing, uncomplicated by obstacles (trees, underground constructions, buildings, etc)
  • Minimal disturbance to the built environment
  • Limited number of welds required
  • High network efficiency: less angles allow higher flow speed, higher load capacity and smaller pipe diameters

Easy and sustainably efficient pre-insulated pipes

With a single flexible polybutene medium pipe, efficient polyolefin foam insulation and protective corrugated HDPE outer case, the Flexalen 600 single line pre-insulated pipe system is an ideal solution for both small and large-scale networks. It effectively tackles any installation routing and time restrictions, while ensuring durable performance for decades to come as a Cradle to Cradle Certified™ Silver pre-insulated pipe system.


Flexalen 600 single lines are available in various dimensions, from OD 25 up to 90mm with an oxygen barrier on the polybutene medium pipe, and up to OD 125mm without oxygen barrier. Different insulation thicknesses are available. All Flexalen pre-insulated pipes are delivered in coil up to 300m (depending on diameter). Custom lengths are available upon request.

Want to get the most out of your network? We offer services to optimize your network design and dimensioning, calculation, training, and technical assistance on site.

  • Sustainability

    Satisfies the requirements for sustainable construction

    Cradle to Cradle certified – for a circular economy!

    Download the certificate in the knowledge center!

  • Health

    Produced without (H)CFC
    Complies to REACH
    Complies to VOC (Volatile organic components)

  • Specificities

    High flexibility

    One system for heating, cooling and potable application

    Light weight

    Compact solution for e.g. air-water heatpumps

  • Service temperature

    Wide temperature range

    Minimum -15°C

    Maximum 95°C

  • Pressure rating




  • Additional information

    For more details contact Thermaflex or download the technical datasheet!

  • Availabilities

    Available with or without Oxygen barrier

    Pipe diameters medium pipe OD16 – OD125

    Pipes in coils of up to 300m (depending on diameter)

Discover the benefits of Flexalen 600 single line for engineers here

… or download the Flexalen Product Guide for technical details in the download section.

Discover the benefits of Flexalen 600 single line for installers here

… or download the Flexalen Product Guide for technical details in the download section.


  Pressure drop PB-pipes PDF 44 KB Preview Download Mail

Pressure drop PB-pipes

Brochures Catalogues

  Flexalen Product Guide PDF 4623 KB Preview Download Mail

The Flexalen Product Guide offers all system, application & technical specifications for all Flexalen product ranges.

  Successful in the past - prepared for the future (PBPSA) PDF 1619 KB Preview Download Mail

This brochure is giving an introduction to Polybutene including a review of the performance of Polybutene pressure piping systems in meeting the needs of sustainable building regulations.

  Flexalen - No1 choice for specifiers around the world PDF 817 KB Preview Download Mail

Why is Flexalen the No1 choice for specifiers around the world?

Installation Manuals

  Flexalen instruction: Laying instruction PDF 1936 KB Preview Download Mail

Laying instruction for Flexalen 600, Flexalen 1000+, Straight lenghts and Flexalen Solar.

  Flexalen instruction: Pressure testing PDF 162 KB Preview Download Mail

Pressure testing and pressure test protocol.

Technical Datasheets

  Pre-insulated pipe - Flexalen 600 Heating/Cooling PDF 278 KB Preview Download Mail
  Pre-insulated pipe - Flexalen 600 Water PDF 240 KB Preview Download Mail
  Pre-insulated pipe - Flexalen 600 FP PDF 300 KB Preview Download Mail

Environmental Certifications

  Cradle to Cradle - Carbon offsetting 2015-2019 PDF 195 KB Preview Download Mail

Thermaflex Isolatie B.V. has offset 290 tonnes of CO2 tooffset 50% of the emissions caused by the production of C2C products (Flexalen 600).

Thermaflex directly invests in emission reduction projects which combine energy, environment and developmental solutions into sustainable business opportunities in developing countries, with the help of the Climate Neutral Group.

  Flexalen 600 - Cradle to Cradle Silver Material Health Certificate PDF 158 KB Preview Download Mail

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