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Flexalen 600 double lines

Combined supply and return: the economical choice
Flexalen 600 double line pre-insulated pipe
Flexalen 600 double line pre-insulated pipe
Flexalen 600 double line pre-insulated pipe

Flexalen 600 double line pre-insulate pipes have been developed as the most energy-efficient solution for smaller scale thermal water transport. This range is highly suitable for compact networks with low to medium energy demand.

Flexalen 600 supply and return

Combining supply and return in the same insulating jacket, the Flexalen 600 double line system is the most economical pre-insulated pipe solution. It lowers the need for materials, while minimizing installation time and costs.

Pre-insulated double lines for compact networks

The  Cradle to Cradle™ Certified Flexalen 600 double lines are uniquely designed to secure an efficient supply for both heating and cooling applications. It combines two polybutene carrier pipes within high-standard polyethylene insulation to ensure an optimal level of energy efficiency. This makes it an ideal solution for small and mid-scale distribution networks, such as group heating.


Flexalen 600 double pipes are available in various dimensions, from OD 25 to 63 mm, with or without oxygen barrier on the polybutene medium pipe. All Flexalen pre-insulated pipes are delivered in coils of up to 300m (depending on the diameter), and can be perfectly combined with all other Flexalen components. Custom lengths are available upon request.

We also offer services to optimize 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: OD20 – OD125

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

Discover the benefits of Flexalen 600 double lines for engineers here

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

Discover the benefits of Flexalen 600 double lines 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

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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