FLEXWELL District Heating Cable-FHK – The Flexible Solution for Demanding District Heating Projects

The FLEXWELL District Heating Cable-FHK is an innovative, flexible, and highly durable piping system designed to meet the highest demands in district heating, district cooling, and domestic hot water systems.​

As a problem solver for many challenging installation situations, it combines maximum efficiency, safety and durability.

Advantages of FLEXWELL-FHK steel casing pipes

Its 100% diffusion-tight steel jacket construction provides outstanding thermal insulation, ensures operational safety, and maximizes energy efficiency—even under extreme conditions.​

A key advantage is the diffusion-tight structure of the PUR foam insulation: fully protected against moisture ingress, it achieves a significantly longer lifespan compared to conventional piping systems. Additionally, an integrated bitumen layer within the pipe construction offers effective mechanical protection against external influences, such as during trenchless installation or in challenging soil conditions.​

Furthermore, the spiral corrugation of the inner pipe ensures excellent ventilation capability and provides exceptionally high resistance to deposits, contributing to the system's long-term efficiency and reliability.​

Versatile installation options for FLEXWELL-FHK

The optimal solution for all installation challenges. Trenchless installation using the horizontal directional drilling method (HDD) enables precise and surface-friendly placement, preserving traffic routes and natural areas.​ FLEXWELL-FHK is designed for extreme conditions. Its high bending flexibility allows it to adapt effortlessly to obstacles, making it ideal for:​

✅ Crossing roads, railways, or bodies of water
✅ Installation in wet soils or groundwater zones
✅ Renovation and expansion of existing pipe networks without extensive excavation

Advantages for planning, installation and operation

Highest flexibility & versatility
→ Installation without couplings, welding or complex insulation
→ Ideal for complex projects thanks to horizontal directional drilling and trenchless installation

Maximum safety & durability
→ Diffusion-tight steel jacket protects against corrosion and external influences
→ PUR foam with significantly extended lifespan
→ Bitumen layer as additional mechanical protection
→ Self-compensating, maintenance-free design

Technical excellence
→ Extremely resistant to high temperatures and pressures
→ Spiral corrugation for excellent ventilation and deposit resistance
→ Tested by accredited laboratories with documented insulation data

Cost-effective installation
→ Reduced civil engineering costs due to small trench dimensions
→ Shorter construction times with pre-assembled continuous lengths

Technical Data at a Glance

Operating Temperature: –170 °C to +150 °C
Operating Pressure: 16 / 25 bar
Dimensions: DN 25–150
Inner Pipe: Stainless steel (spiral corrugated)
Outer Pipe: Stainless steel
Thermal Insulation: High-quality polyurethane (PUR) foam with bitumen protection

Rely on proven quality and maximum efficiency
Whether for heating water, domestic hot water, or condensate — FLEXWELL-FHK offers a future-proof solution for any district heating application. Its unique construction, high load capacity, and flexible application possibilities make it one of the most efficient and safest piping systems on the market.​

Learn more & get a non-binding consultation:
Contact us now — we look forward to your project!