Flexalen® 600 is a flexible, all-in-one pre-insulated pipe system for underground district heating, cooling, domestic water, and geothermal networks. With lightweight PB-1 service pipes, premium polyolefin foam insulation, and robust HDPE casing, it delivers reliable thermal performance, high pressure and temperature resistance, and rapid installation with fewer fittings.
One system for thermal networks. Flexible, fast, and future‑proof.
Flexalen® 600 offers one piping system for heating networks, cooling networks, and potable water, available as single or twin pipes, with and without EVOH layer, in coils or straight lengths with optional frost-protection cables (coils only).
The PB-1 service pipes, made of closed-cell polyolefin foam, and impact-resistant HDPE casing provide high pressure and temperature ratings, superior moisture resistance, and minimal heat loss throughout the system lifetime.
Homogeneously welded PB-1 joints create leak-tight connections that ensure system efficiency and reduce installation risk. Flexalen® 600 meets EN 15632-1/3, holds KIWA certification, and is C2C Certified® Full Scope, making it the most sustainable choice for district heating and cooling projects.
Performance you can trust
Why Choose Flexalen® 600
Select Flexalen® 600 when projects demand flexible installation, long‑term efficiency, and best‑in‑class sustainability credentials for your DHC projects.
Cradle to Cradle Silver Sustainability
The only pre-insulated pipe with Cradle to Cradle Silver Certification. Supports DGNB, LEED, and BREEAM credits and circular construction objectives.
Moisture‑Resistant, Long‑Life Insulation
Closed-cell polyolefin foam resists water-vapour diffusion, minimizing heat loss and protecting against ground moisture for decades.
Homogeneous Welded Connections
PB-1 pipes and fittings are fully weldable, creating homogeneous, leak-tight joints that ensure durability and energy efficiency throughout the system lifetime.
High Pressure & Temperature Resistance
PB‑1 service pipes and closed‑cell foam insulation provide operating temperatures up to 95 °C and high pressure ratings, verified to EN 15632 and related standards.
Flexible & Fast to Install
Lightweight, highly flexible coils and sticks reduce the number of fittings, speed up trench work, and simplify routing around obstacles.
All‑in‑One Network Solution
One system for district heating, cooling, domestic hot water, and geothermal distribution, with single and double pipe options.
Flexalen® 600 EVOH
Flexalen® 600
Flexalen® 600 Water
Flexalen® 600 Frost Protection
Flexalen® 600 SLP
Witness our impact in every project
EXPERIENCE THE THERMAFLEX DIFFERENCE
Why work with us
Thermaflex combines decades of expertise with a commitment to sustainable innovation. As your trusted partner, we deliver more than products, we provide comprehensive technical support, proven solutions, and collaborative partnerships that help you achieve project success, regulatory compliance, and long-term operational efficiency across various markets and applications worldwide.
Trusted benefits
- Expert support
- Global experience
- Reliable delivery
- Flexible solutions
- Innovative approach
Partner advantages
- Sustainable practices
- Technical guidance
- Long-term partnerships
- Proven quality
- Customer-focused
FREE WHITEPAPER
The biggest mistake to avoid when calculating heating networks
Designing heating networks can be a real challenge. In this whitepaper you will learn all about the biggest mistakes to avoid.
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