GEROtherm® VARIO-RTThe conical, pressureoptimized geothermal probe for elevated temperatures and cracking resistance


Double-U probe for shallow geothermal use. Resists internal pressure up to PN16@20°C and PN20@20°C.


The geometry of the foot (U-bend) is identical to that of the DUPLEX double-U probes. Optimised probe pipe with the same outside diameter as the DUPLEX double-U probes with variable wall thickness made from PE100-RT-RC*.

Product details


  • Polyethylene PE100-RT-RC* (RT = raised temperature; RC = resistance to crack)


  • Temperature range: -20°C /­ +95°C1)

  • Pressure resistance: up to PN16 @ 20°C
  • Dimensions: de 32 mm, de 40 mm

  • Pressure resistance: up to PN20 @ 20°C
  • Dimensions: de 40 mm

* Geothermal probes made from PE100-RT-RC is a protected technology. Patent No. CH 717 800 A2.
1) The expected durability of the material depends on the duration and temperature of use, along with the inside pressure. The load limits are calculated based on the cumulative damage rule (Miner’s rule) as per SN EN ISO 13760. (For an object-specific definition, the annual frequency temperature profile and the inside pressure must be provided.)

For further product details, please refer to the corresponding Technical datasheets or the Flyer.


  • Pressure resistance up to 16 bar or up to 20 bar@20°C
  • Probe foot (U-bend) resists internal pressure up to 25 bar@20°C
  • Optimised hydraulic pressure loss and therefore more efficient overall systems
  • 100% plastic for better corrosion resistance
  • Significantly improved buckling pressure resistance in the lower section
  • Same diagonal dimension as DUPLEX probes
  • Compatible with the GEROtherm® weight system‎, the GEROtherm® PUSH-FIX impact-resistant sleeve including weight connector and the GEROtherm® UNI-FIX universal weight mounting
  • Proven mud container in probe foot (U-bend) with two new ribs that make it easier to use a measuring float
  • Installation conditions similar to those for standard probes
  • Patent No. EP 2 395 301; EP 2 706 308 and CHF 717 800 A2

Please refer to the corresponding Tender specifications for a more detailed product description.

Price list

(For the price list in € please contact our sales team.)


Dimension Pressure resistance
Standard lengths
Ø probe foot
Coil dimensions
32 x 3.0 mmup to PN16@20°C /­ up to SDR11 100 - 160 meter 92 mm Probes
40 x 3.7 mmup to PN16@20°C /­ up to SDR11 100 - 160 meter 113 mm Probes
40 x 4.5 mmup to PN20@20°C /­ up to SDR9170 - 250 meter113 mmProbes
Factory certificate as per EN 10204 2.2


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