GEROtherm® VARIOThe conical pressure-optimised geothermal probe


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


The geometry of the probe 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 PE 100-RC.

Product details


  • Polyethylene PE100-RC (RC = resistance to crack)


  • Temperature range: –20°C/­+40°C

  • Pressure resistance: up to PN16@ 20°C/­SDR 11
  • Dimensions: de 32mm, de 40mm

  • Pressure resistance: up to PN20@ 20°C/­SDR 9
  • Dimensions: de 40mm, de 50mm

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


  • Pressure resistance up to 16 bar or 20 bar
  • Probe foot (U-bend) resists internal pressure up PN25
  • 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 2 706 308
  • SKZ certified and monitored SKZ certificate No. A278
  • Certified and monitored by KIWA KOMO certificate No.: K84660/­02

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 mm up to PN20@20°C /­ up to SDR9 170 - 250 meter 113 mm Probes
50 x 5.6 mmup to PN20@20°C /­ up to SDR9170 - 250 meter143 mmProbes
* @ 20°C
Factory certificate as per EN 10204 2.2




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