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Flexible solutions for generations to come

The human right to housing is more than 4 walls and a roof. It is also the right of protection from cold and heat, now and in the future. Heating, cooling, domestic and potable water should be available anytime, anywhere. At the heart of that protection lies an efficient underground distribution system. But how can we secure a reliable and efficient supply to maximize our use of energy at minimal financial, environmental and infrastructural cost?

Safety first – for people, and environment !

Installing new pipelines in congested ground conditions can be a difficult challenge for designers and installers. There is a lot of pressure to do this quickly, yet effectively, with minimal disruptions to surroundings and building structures. Regulations also increasingly require these installations to be durable.

The good news is; we can help! Together with leading energy and water suppliers we have developed flexible maintenance-free solutions that are safe and sustainable, yet fast to implement, ensuring an efficient supply for generations to come. We tailor our solutions to all needs and conditions; space restrictions and difficult ground conditions are our bread and butter!

We know how

We have over 30 years of experience implementing our systems in all types of conditions, each with its own challenges. As we keep close to our stakeholders, it gives us the opportunity to understand the real challenges that need to be solved.

Take a hotel resort that wants to ensure the best satisfaction for their guests. That requires an infrastructure that works safely under all different load conditions, for both heating and cooling. A hospital has to provide the highest health standards in their systems - at all times. A city needs reliable  heating in harsh winters to keep its citizens alive.

We are faced with these crucial challenges everywhere around the world. 

Ask our specialists how we can answer to your needs. With our full support in every step of the way, from engineering to the final pressure tests, we make sure you realize your goals.

We co-operate with traditional owners as well as new investors to implement fast, reliable and sustainable network solutions for all types of projects with minimal disturbance and optimal benefits for our stakeholders.

Sustainability is key

That's our ambition. A durable design to secure valuable living for now and generations to come is the reason why. We hold ourselves responsible for the future and strive for a circular economy - our systems are perfectly attuned to those values.

Underground Solutions for Heating & Cooling, Hot & Cold potable water

Thermaflex FLEXALEN
Flexible, pre-insulated piping system, with PB-1 medium pipes, Polyolefin insulation and Polyethylene outer casing – completely recyclable.

Temperature range: -10°C to +95°C
Pressure ranges:

  • 8 - 16 bar (depending on operating temperature) until d110
  • 5 - 10 bar (depending on operating temperature) until d225

Dimension range: d16 – d225 (DN12 – DN200)
Pipe length: up to 300m for coiled material (d16 – d125)
6 or 12 m for semi flexible sticks (d50 – d225)
Certification: KIWA, CSTB, DVGW, GHOST
Standard reference: EN 15632, CSTB, DVGW, BRL, GHOST

Fittings: PB-1 fittings for electro fusion, socket- and butt fusion
Transition fittings: Available to connect to all standard types of materials, valves and other components
Prefabrications: Tailor made prefabrications for branches, elbows etc


  EuroHeat&Power: Optimized heating and cooling systems PDF 270 KB Preview Download Mail

New economic connection solution for flexible piping: optimized heating and cooling systems for low energy housing developments. 

(EuroHeat&Power Magazine, English Edition, Feb. 2013)

  EuroHeat&Power: Innovative concept with flexible pipes PDF 435 KB Preview Download Mail

Innovative Concept with flexible pipes: 

New Record: 1,5 hours for ten house connections.

(EuroHeat&Power Magazine, English Edition, Nov. 2014)

Brochures Catalogues

  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?

White Papers

  Whitepaper 6: Future proofing the DHC network PDF 612 KB Preview Download Mail

During the District Heating and Cooling Symposium 2010 in Tallinn Thermaflex presented 5 papers addressing the benefits of flexible pipe systems and tailored prefabricated solutions over the entire network lifetime, exemplified by the pre-insulated piping system Flexalen 600. Since that time Thermaflex achieved a global acceptance of the introduced solutions as they have been successfully implemented in numerous District Heating and Cooling network applications all over the world. This formed the basis for further developments since 2010. Production facilities have been up-scaled to meet an increasing demand and quality level. The cooperation of R&D with key stakeholders focused on responding to their challenges with new and improved solutions.

  Engineering functionality PDF 374 KB Preview Download Mail

Awareness of the total costs of heating & cooling networks is rapidly increasing. Optimisation and smart designs offer more options and choices to important added value. Thermaflex focusses on minimizing “total cost of ownership” and maximizing the speed of implementation of these networks. A support program for innovative network design, available to all professional designers/engineers, offers the right solution/tool in combination with Flexalen network concepts.

  Verification of heat loss measurements PDF 328 KB Preview Download Mail

Heat loss tests are performed on different samples of the Thermaflex Flexalen 600 series and one ST-PUR-PE sample with the Thermaflex heat loss equipment and at two recognized test facilities, both using different test methods. The results of the institute using the same, guarded end method comply with the Thermaflex heat loss equipment’s results. The results of the institute using the calculated end method differ considerably from the Thermaflex results. In this paper a comparison of these methods and results and a verification of the Thermaflex heat loss equipment is given.


  Bureau Veritas Ship building approval Flexalen 600 PDF 793 KB Preview Download Mail

Certificate number: 21665/B0 BV. 

Type of product: Thermoplastic material pipes and fittings, Flexalen 600. 

(July 2014).

  KIWA International Conformity EN15632 Flexalen 600 PDF 524 KB Preview Download Mail

KIWA International Conformity EN15632 part1 and 3 - Flexalen 600.

(May 2011).

  KIWA - KOMO Certificate BRL 5609 - Flexalen 600 PDF 1179 KB Preview Download Mail

KIWA - KOMO technical approval-with-product certificate for Flexalen 600. 

(January 2007).

  Earth Quake resistance certificate PDF 735 KB Preview Download Mail

Technical report of dynamic tests performed on Flexalen pre-insulated pipe systems, simulating seismic with 7-9 intensity on the MSK-64 scale.
Flexalen is recommended for applications in the regions with seismic activity of 7-9 magnitude.


Radius 10 Km
200 Km
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