DVGW-certified geothermal drilling and borehole heat exchanger fields up to 400 m depth in North Rhine-Westphalia
Frolov GmbH
Wegberg (headquarters) · Service area: all of North Rhine-WestphaliaNew on Amplifa
About Frolov GmbH
Frolov GmbH is a DVGW-certified master craft business based in Wegberg (Rhein-Kreis Neuss district of Heinsberg) with over 20 years of experience in planning and executing geothermal drilling and well construction in North Rhine-Westphalia. The company implements shallow geothermal energy for projects of all sizes – from individual single-family homes to complete borehole fields for heating networks, residential quarters and commercial properties. Drilling is carried out with its own Geotec double-head drilling rigs (ROTOMAX XL GT) to a depth of 400 m, in accordance with VDI 4640 and DVGW W120-2, including installation of the borehole heat exchangers, thermally conductive backfilling, and pressure and leak testing. As a certified specialist company under the Water Resources Act (TÜV Rheinland), the company installs pipework on borehole heat exchanger and geothermal systems made of thermoplastics. The full-service offering includes feasibility assessment, thermal response testing, permits, construction management, subsidy consultation and standards-compliant documentation.
- Site
- Wegberg
- Processes
- Geothermal drilling (deep drilling up to 400 m depth, DVGW W120-2 G 400), Borehole heat exchanger installation and backfilling in accordance with VDI 4640 incl. pressure and, Core drilling through basement walls (wall penetration), Well drilling / well construction, Thermal Response Test (TRT), Geophysical borehole logging (Cemtrekker) for quality assurance, Planning & design of borehole field systems (feasibility, site analysis, permits, documentation), Construction management & project management for geothermal projects (full service)
- Materials
- Borehole heat exchangers 32 mm double-U (thermoplastic/PE), Thermoplastics (pipework for borehole heat exchangers), thermally conductive backfill material (grouting material in accordance with VDI 4640), Thermoplastics, Thermally conductive backfill material
- Certificates
- DVGW specialist company W120-2 (G 400, borehole heat exchangers up to 400 m, Specialist company under the WHG (§ 62 AwSV) – borehole heat, DVGW-certified specialist company W120-2 (G 400), WHA specialist company (§ 62 AwSV, TÜV Rheinland), ISO 9001
- Founded
- 2003
- Industries
- Private clients (single/two-family houses), Housing sector / apartment buildings, Construction companies & general contractors, Commercial & industrial, Municipal utilities & heating networks (cold local heating), Municipalities & public sector
- 01
Feasibility & site analysis
- 02
Planning & design of the borehole field system
- 03
Permits (water law permit, drilling notification to the mining authority)
- 04
Geothermal drilling with double-head drilling rig
- 05
Installation of the borehole heat exchanger
- 06
Backfilling in accordance with VDI 4640
- 07
Pressure and leak testing
- 08
Construction management & documentation
Materials & Supplies
Borehole heat exchangers 32 mm double-U (thermoplastic/PE)
Heat exchanger pipe systems for circulation of the brine heat transfer medium.
Thermoplastics
Material of the pipework on borehole heat exchanger and geothermal systems (WHA-certified specialist company).
Thermally conductive backfill material
Borehole grouting material in accordance with VDI 4640 for heat transfer and groundwater protection.
Location
Wegberg
DEHeadquarters and service area covering all of North Rhine-Westphalia
- Lot size
- Single boreholes to complete borehole fields
- Materials
- PE heat exchangers, thermally conductive backfill material
- Geotec double-head drilling rig ROTOMAX XL GT
- Geotec double-head drilling rigs
- Cemtrekker (geophysical borehole logging)
Components & Services
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Geothermal drilling (deep drilling up to 400 m depth, DVGW W120-2 G 400)Drilling technology/Geothermal energy | – | 400 m drilling depth | – | Borehole fields for heating networks | Borehole heat exchangers (double-U, PE/thermoplastics), thermally conductive backfill material, brine as heat transfer medium |
| Borehole heat exchanger installation and backfilling in accordance with VDI 4640 incl. pressure andDrilling technology/Geothermal energy | – | – | – | – | thermally conductive backfill material, borehole heat exchanger pipes |
| Core drilling through basement walls (wall penetration)Drilling technology | – | – | – | – | – |
| Well drilling / well constructionDrilling technology | – | – | – | – | – |
| Thermal Response Test (TRT)Testing | – | – | – | – | – |
| Geophysical borehole logging (Cemtrekker) for quality assuranceTesting | – | – | – | – | – |
| Planning & design of borehole field systems (feasibility, site analysis, permits, documentation)Engineering | – | – | – | – | – |
| Construction management & project management for geothermal projects (full service)Engineering | – | – | – | – | – |
| Installation of pipework on HBV systems (WHA specialist company, materials: thermoplastics)Joining | – | – | – | – | Thermoplastics |
3 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Double-head drilling rig | Geotec ROTOMAX XL GT | – | Drilling up to 400 m depth | – | Wegberg (service area North Rhine-Westphalia) |
| Geotec double-head drilling rigs | Geotec | – | – | – | Wegberg |
| Cemtrekker geophysical borehole logging | Cemtrekker | – | – | – | – |
Additional services
Quality & Certifications
Work carried out in accordance with VDI 4640 and DVGW W120-2 with continuous monitoring of pressure, depth and rock strata. Quality documentation via material samples, pressure and leak testing, and geophysical borehole logging (Cemtrekker).
| Evidence | Wegberg |
|---|---|
| DVGW-certified specialist company W120-2 (G 400) | |
| WHA specialist company (§ 62 AwSV, TÜV Rheinland) | |
| ISO 9001 |
History
- 2003
Founding of Frolov GmbH
- 2010
Initial certification as a DVGW specialist company under W120-2 (07.04.2010)
- 2024
Renewal of DVGW certification W120-2 (G 400, register no. 7.01.0288), valid until 05.06.2029
- 2025
TÜV Rheinland recognition as a WHA specialist company (certificate no. Z2542186856, valid August 2025 to June 2027)