About us

- Welding process according to DVS standard
- Highest quality standards
- Unique delivery speed
Your specialist for geothermal systems
Many construction projects in which geothermal energy is planned as a sustainable source of heating and cooling cannot be completed on time. This is due to long production and delivery times for geothermal components. At the same time, climate change is progressing ever faster and it is high time to do something about the destruction of our environment.
We at GNV want to solve both problems. We have recognized that the heat transition can only be achieved through new technologies and innovations.
That is why we produce distributors for geothermal and ice storage systems with fully automated processing methods. In this way, we ensure a fast and reliable supply of geothermal components throughout Europe and thus counteract global climate change.

Our products
Geothermal heat distributor
The geothermal manifold is an important device for hydraulic balancing of the geothermal probe, for venting the system and for individual control of the probes. With our identical plastic flow meters, you have a choice of four different sizes.
Geothermal shafts
Shaft for installing the geothermal heat distributor outside the building. A shaft keeps condensation away from the building, provides easy access for tradesmen and replaces a boiler room. We can easily install shaft systems with up to 125 probes.
Well shafts
Our polyethylene well shafts are significantly lighter, do not require complex core drilling, have prefabricated connections and can be installed quickly. These are advantages that conventional concrete rings cannot offer. At GNV, the well shafts can be customized.
Ice storage systems & energy fences
We can offer ice storage systems and energy fences in all variants thanks to our high level of automation. We can offer our ice storage systems and energy fences in all variants thanks to our high level of automation.
Technisches Zubehör
Für den fachgerechten und wirtschaftlichen Einbau von Erdwärmesystemen erhalten Sie bei uns das erforderliche Zubehör an Bauteilen, Hilfsvorrichtungen und Schweißgeräten.
From domestic garage to industrial company

„My dream is to leave the planet better than I found it. Das ist einer der ausschlaggebenden Gründe, warum ich die Firma meines Vaters, Georg Neumann, übernommen habe. As an entrepreneur, I have a great deal of leverage to positively influence my environment so that future generations can also experience a planet worth living on in the future.””
The story
Comprehensive expansion of the production area with offices and storage facilities to an area of 150 m².
Sandro Neumann takes over GN Schweisstechnik GmbH as owner and managing director.
Eigene Bauteile zur effizienteren Produktion werden konstruiert und hergestellt.
Die GN Schweisstechnik GmbH wird als Preisträger in der Kategorie “Zukunftsfähige Nachfolge” ausgezeichnet.
FAQ
- GN B Mini – No load class
- GN R Mini – A15
- GN R Compact – up to A35
- GN R Medium – up to A35
- GN 1 – up to A15
- GN 2 – up to A15
- GN 3 – up to A15
- GN X1 – up to D400
- GN X2 – up to D400
GN R Mini, GN R Compact, GN R Medium, GN 1 and GN 2: can each be equipped with a PE plate to keep the shaft in position
GN X1 and GN X2: If the water pressure is too high and structural verification is required, the GN X series must be used. Here, a load distribution plate serves as buoyancy protection
For this purpose, we have developed our unique SEB system (floor and wall feed-through system). This includes the following components:
Standard scope
- Welded PE plate on the probes, including seal for the PE plate
Optional
- Upper frame: Suspension of the manifold on a solid frame. Guarantees that the manifold stays in place at all times, even under extreme weather conditions
- Lower frame: The lower frame is separate from the upper frame. This guarantees 100% water tightness and stable support on the blinding layer. The lower frame is usually cast into the base plate
- Telescoping of the frames
- Additional feed-throughs for e.g. fiber optic cables or electrical lines