More than ten years development is done on the highly innovative closed heat exchanger by the brothers Jacob and Reijer Lehmann from Demar Heiwerken. In 2008 all effort was rewarded with the Invention Herman Wijffels Price from the Rabobank.

Besides the unique invention the brothers started a co-operation with Jean Heybroek BV, for the drilling of an earth heat exchanger. The latter company has a long experience in the field of horizontal directional drilling. Both companies have developed a unique and highly effective drilling system/method to lower the installation costs, compared to the conventional vertical drilling method. Moreover, this new drilling method meets all requirements mentioned in the new drill protocol that will be introduced on January 1, 2011. This ensures the client and installer from a secure and sustainable heat exchanger that can regenerate heat and cold for decades from the soil.

Through the combination of forces, developments and businesses, by Demar Heiwerken and Jean Heybroek, the company Geothex B.V. was founded in March 2010 with settlement in Houten. Geothex B.V. provides a unique concept for the installation of earth heat exchangers. The products supplied by Geothex differ in two main groups:

  • The Geothex heat exchanger and all installation accessories
  • The special drilling method for drilling technique and drilling accessories