tube pré isolé chauffage

Double heating

Highly flexible, pre-insulated pipe systems, combining both the flow and the return carrier pipes in the same jacket pipe, primarily intended for the transport of heating water, or other heat-transfer media, in underground distribution networks.

The carrier pipes are made from cross-linked PE-Xa with an orange coloured oxygen-diffusion barrier for the flow line, and a blue coloured for the return. The colour code enables easy identification of flow and return during installation, even with mounted shrink end caps.

The multi-layer thermal insulation is made from cross-linked, microcellular PE-X foam with a water-repellent closed cell structure, characterised by its durable, non-ageing insulation performance, and its permanent elasticity, maximizing the thickness of the insulation layer, even after multiple times bending.

The high-grade, double walled, corrugated HDPE sleeve shields the pre-insulated pipe system against mechanical impacts and moist, whilst maintaining maximum flexibility.

  • Carrier pipes: PE-Xa/SDR 11/PN6
  • EVOH Oxygen barrier in accordance with DIN 4726
  • Max fluid temperature: + 95 °C
  • PE-X insulation foam: < 1% water absorption in accordance with ISO 2896
  • Full coil length, all dimensions: 100 m
  • Designed in accordance with European standard EN 15632-3
  • CFC-free production process


Double heating
Jacket PipeMedium pipeBending radiusWater contentHeat capacity“U” Value
Art. No.dout (mm)dout/s/dinDN (din)[m](1)[l/m](2)avg [kW](3)[W/(mK)](4)
HD14025140 25/2,3/20,4200,200,654300,221
HD16050 16050/4,6/40,8400,602,6141400,400

(1) The indicated minimum Bending Radius can be applied permanently without affecting the system’s quality or performance
(2) The Water Content is expressed in liters per meter length of pre-insulated pipe, including flow + return volume
(3) Average Heat Capacity in kW for the carrier pipe (at Twater of 80°C with a ΔT of 20°C)
(4) The U-value enables easy heat loss calculation, as a function of the driving temperature difference (calculation method: see page 46)

The installation of adequately anchored Fix Points at the system’s extremities (typical at wall penetrations) is mandatory. This to secure the connected plumbing against the potential impact of the system’s dilatation forces (thermal expansion/retraction). Failing to do so involves a genuine damage risk, and automatically voids the system warranty.

To prevent ingress of (ground)water, the EN 15632-3 standard prescribes the usage of Shrink End Caps to seal the non-bonded system layers at underground connections. Failing to do so involves a genuine damage risk, and automatically voids the system warranty.