Answers and frequently asked questions

The FLEXWELL FHK district heating cable is a flexible, double-walled stainless steel pipe system with PUR insulation for district heating, district cooling and domestic hot water. It impresses with its 100 % diffusion tightness, high energy efficiency, long service life and quick and easy installation. Particularly suitable for demanding installations in a wide variety of district heating projects. 

The FLEXWELL-FHK is laid trenchlessly or conventionally. The high flexibility allows flexible routing over roads, railway tracks or waterways. Horizontal directional drilling (HDD) enables minimally invasive installation, especially in urban or sensitive areas.    

The FLEXWELL-FHK can be monitored with the WIREM system. This measures resistance values, detects moisture or leaks at an early stage and localises damage precisely. This ensures maximum operational reliability.

FLEXWELL-FHK is ideal for district heating pipes, district cooling and domestic hot water. The pipe system is particularly suitable for renovations, urban areas and routes that are difficult to access.

Compared to conventional district heating pipes, the flexible FLEXWELL-FHK is generally quicker to install, especially in demanding ambient conditions. It is 100 per cent diffusion-tight, low-maintenance and energy-efficient.

The CASAFLEX district heating pipe is a flexible, self-compensating pipe system with a spirally corrugated stainless steel inner pipe and high-quality thermal insulation. It is designed for high temperatures and pressures and is ideal for house connections and complex pipe runs.

CASAFLEX offers a maximum operating temperature of 150 °C (briefly up to 180 °C), operating pressures of 16 or 25 bar and is available in the UNO (one carrier pipe) and DUO (two carrier pipes) versions. The carrier pipe is made of spirally corrugated stainless steel and the thermal insulation is made of PIR rigid foam.

Thanks to its high flexibility, CASAFLEX can be laid directly from the drum without additional welding work or joint installation. This enables fast and cost-effective installation, even in narrow routes or difficult ground conditions.

CASAFLEX is ideal for house connections or as primary supply lines in local or district heating networks. Their flexibility and robustness make them the ideal solution for a wide range of applications.

CASAFLEX is compatible with existing plastic casing pipe systems such as PREMANT and can be easily integrated into new construction projects, network renovations or expansions.

FLEXSTAR is a highly flexible, pre-insulated pipe system that has been specially developed for connecting heat pumps and for use in local heating networks or house-to-house connections. Thanks to the small bending radii, installation is possible in the tightest of spaces and without house entry bends.

FLEXSTAR is designed for operating temperatures up to 95 °C (short-term) and operating pressures up to PN 6. The carrier pipe is made of PEXa with an EVOH oxygen barrier, the thermal insulation is made of PUR foam with a lambda value of 0.024 W/m-K. The system is longitudinally watertight in accordance with DIN EN 15632-2.

Thanks to its high flexibility and small bending radii, FLEXSTAR can be easily transported by just one person. The small dimensions of the compact ring mean that FLEXSTAR takes up very little space in the warehouse. It can also be transported quickly and easily using small transport vehicles, which massively reduces the effort required to bring the pipe to the construction site.

FLEXSTAR impresses with its high degree of flexibility, which makes installation and connection much easier.

The high-quality PUR insulation with a lambda value of 0.024 W/m-K significantly reduces heat loss. Compared to conventional PE insulation, up to 40 % better insulation values can be achieved, resulting in increased energy efficiency.