PGeothermal Products Made to Measure
– Manufactured in the Allgäu, Bavaria
Geser Erdwärme has been developing and manufacturing high-quality components for geothermal systems since 1979 – from practice, for practice. Our complete product range covers every stage of a geothermal installation: from drilling and probes to distribution and filling. All products are developed and manufactured to made-to-measure quality at our sites in Westallgäu, Bavaria, or sourced with strict quality controls.
Geothermal probes
Geothermal probes are the heart of every geothermal system. Brine circulates through the vertically installed plastic pipes (usually U-shaped), extracting heat from the ground and transferring it to the heat pump. Geser offers probes for all standard systems and depths – in diameters DA32, DA40, DA50 and larger, for single- and multi-circuit systems.
Geser quality standard: All probe materials are subject to third-party monitoring by an accredited institute (SKZ quality mark). System approvals are in place.
Ground probe foot
The ground probe base forms the bottom of the geothermal probe – the turning point of the brine flow in the borehole. Geser developed an innovative probe base in 1994. Today the range covers bases for all standard probe diameters and systems, including variants for:
- Standard EWS systems (single-circuit and dual-circuit)
- Energy piles (probe inserted by vibration into filled concrete pile)
- Special requirements for international markets (e.g., d55 1-circuit oval, d63 1-circuit oval for Finland)
Probe accessories
Complete range of accessories for the professional installation of geothermal probes:
- Anti-buoyancy and weighting systems for probe installation
- Components for pressure testing
- Probe camera systems for inspections at depths of up to 350 m
- Probe anchors (GESER probe anchor, developed by Michael Geser, small-series production since 2022)
Waterjet cutting
Geser operates a Mach 3b with Dynamic Waterjet technology, featuring a cutting pressure of 4,150 bar and a working area of 2 × 4 m. This enables us to manufacture highly precise seals and components from almost any material:
- Preventer seals – for sealing boreholes
- Wellhead seals – for geothermal probe connections
- Custom seals – including top-wall seals, annular-space seals and wear-resistant rubber components
- Precision cutting of steel, marble, stone, glass and composite materialsWaterjet cutting services are also available for external customer orders.
Manholes
Manholes protect the distribution system and must be completely watertight – even under groundwater pressure. Geser manholes are available as:
- Lightweight design (eco white, eco 480) – fully plastic, for standard small systems
- Rectangular manholes – for larger distribution systems
- Round manholes – space-saving, for confined installation situations
- Submarine manholes – for permanently water-bearing locationsAll manholes are watertight; penetrations permanently pressure-watertight sealed.
Drilling accessories
Professional drilling accessories for geothermal probe drilling:
- Drill rods and casing systems for different geological conditions
- Complete ranges of drill-string accessories
- Preventers, overflow heads and discharge pipes, including the newly developed rubber-coated discharge pipe for large compressors, introduced in 2022
Installation aids
Specially developed installation aids for the safe and efficient installation of geothermal probes:
- Installation reels, available in standard and hydraulic versions, for the controlled lowering of geothermal probes
- Guidance and weighting systems for installation in groundwater areas
Brine liquid
Brine is the heat transfer fluid in a geothermal system. Geser supplies certified brine liquids (water-glycol mixtures, frost protection to at least -15 °C) for EWS systems, horizontal collectors and direct evaporation systems. Only approved, environmentally compliant products are supplied.
Grouting material and rinsing additives
After probe installation, the borehole annular space must be completely and continuously grouted from probe base to surface (per VDI 4640). Grouting material serves to: thermally couple the probe to the surrounding rock, hydraulically seal and separate groundwater horizons, and stabilize the borehole. Geser supplies approved grouting mortars and rinsing additives meeting all regulatory requirements.
Produktkatalog & Downloads
The complete GESER product catalog 2025 and configuration tools for distributors and manholes are available on our service page
FAQ
Stefan Geser has been active in drilling and geothermal energy since 1979, building an extensive wealth of expertise. This knowledge is available to customers through personal consultation – covering planning, component selection, and technical questions about geothermal probe systems.
Geser operates a Mach 3b waterjet machine with dynamic waterjet, cutting pressure 4,150 bar and a working area of 2 × 4 m. Products include preventer seals, wellhead seals, and special seals in various designs, as well as precision cuts in steel, marble, stone, glass, composites, and virtually all other materials – gently and precisely.
Geser Geothermal offers a comprehensive product range for geothermal systems. This includes geothermal probes, probe bases, manifolds and manifold shafts, drilling accessories, installation aids, electrofusion fittings, brine fluids, as well as grouting materials and flushing additives.
Geser offers geothermal probes for different system sizes, depths and applications. Available options include systems in diameters DA32, DA40 and DA50, as well as special solutions such as the Separatus probe for single- and multi-circuit systems. The probe materials used are subject to third-party monitoring by an accredited institute.
Geser manufactures standard and Vario distributors that can be configured according to the number of geothermal probes and the required flow rates. Various types of manholes are also available, including lightweight plastic manholes, rectangular manholes, round manholes and custom-built submarine manholes.
Yes. The product range includes various installation aids such as installation reels, flushing trays, weighting systems, pressure-testing components and probe anchors. Geser also offers camera systems for inspecting geothermal probes to depths of up to 350 metres.
Geser supplies approved brine liquids and antifreeze concentrates based on ethylene glycol and propylene glycol. They can be used in geothermal probe systems, horizontal collector systems and direct evaporation systems. The supplied products comply with the requirements for groundwater-compatible heat transfer fluids.
Yes. Geser offers professional drilling accessories such as down-the-hole hammers, drill rods, casings, eccentric drill bits and additional drill-string accessories. Geser also supplies tested grouting materials and rinsing additives that support thermal coupling, hydraulic sealing and borehole stabilization.