The invention relates to a geothermal probe 2 made of polyethylene. This comprises a one-piece body 4 with at least two collars 10 aligned in parallel for connection to at least two geothermal tubes 25, 60. The body 4 has at least one U-shaped channel interconnecting the two sleeves 10, the U-shaped channel being smooth is and has no cross-sectional constrictions, and the geothermal probe 2 is machined out of a single polyethylene block by machining. In addition, the invention relates to a geothermal ear 60 with external longitudinal corrugation, wherein the longitudinal corrugation has a corrugation depth between 1.5 and 0.2 mm, preferably between 1.0 and 0.4 mm and more preferably between 0.6 and 0.4 mm and to a geothermal probe comprising a geothermal probe 2 according to the invention and / or having a geothermal ear with external longitudinal corrugation according to the invention.
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