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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint746,904 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureSpecialist foundation engineeringSt. GallenAQUATECH - DIEM GMBH
AQUATECH - DIEM GMBH Logo
Verified· 2 sourcesTrust Score
Summary

About the company

AQUATECH - DIEM GMBH tests heat exchangers for leaks and carries out stainless-steel pipework and valve overhauls. The company also sells fittings and supplies water softening and demineralisation equipment, as well as custom-made products.

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Service area

Offering

Products & services

Industry:Specialist foundation engineering
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AQUATECH - DIEM GMBH

✓ Offered8
Heat exchanger leak testing
Leak testing of heat exchangers using hydrogen testing; leak detection on metal and seals, without opening the units, with the necessary adapters for connection.
Orbital welding
Orbital welding for pipework and connections, supplemented by manual welding to ISO 9606-1 and welding process 141 TIG.
Stainless steel pipework construction
Stainless steel pipework construction in 304L and 316L, including press pipework 15 to 54 mm, as well as execution to ISO 9606-1.
Threaded fittings and valves
Distribution of M&S, Guth, Kieselmann and GEA/Tuchenhagen fittings, as well as valve overhauls from various manufacturers.
Water decalcification systems
Water decalcification systems for single-family and multi-family houses, with demand-based sizing according to water consumption and local water hardness.
Full desalination units
Full desalination units for lower demand for pure water; ion exchange for fully desalinated and demineralised water with distillate-like quality.
Custom special fabrications
Custom special fabrications according to customer requirements, including manufactured adapters for test connections and customer-specific solutions in the pipework sector.
M&S fittings
Distribution of M&S fittings with a complete range, as part of the offering for threaded fittings, valves and pipework accessories.
Trust & reputation

ranQ Trust Score of AQUATECH - DIEM GMBH

Trust Score

No score yet

x

A published score requires a data basis of at least 50% and data from at least two criteria groups other than identity. Missing evidence: Review quality, Review volume, Review recency, Media authority

Data basis 54% · As of November 2026

AQUATECH - DIEM GMBH has no value in the Reputation area of the ranQ Trust Score because no data is available. The area carries 42% of the weighting and drops out of the calculation for this profile; it does not lower the score, only the reported data basis.
x
CriterionValueWeight
  • Review quality: No data point — the criterion is taken out of the weighting and does not lower the score.—24%
  • Review volume: No data point — the criterion is taken out of the weighting and does not lower the score.—10%
  • Review recency: No data point — the criterion is taken out of the weighting and does not lower the score.—8%
AQUATECH - DIEM GMBH scores 83.0 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
x
CriterionValueWeight
  • Establishment: Years since founding or brand launch, logarithmic. The maximum is reached at 15 years.100.012%
  • Company size: The headcount band, researched by ranQ or stated by the company. It is scored in steps rather than by head count, because the data only provides bands.55.07%
AQUATECH - DIEM GMBH scores 86.7 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
x
CriterionValueWeight
  • Verification: Official register entry (commercial register with UID or professional-body record, 55 points), confirmed domain (20 points) and confirmed ranQ profile (up to 25 points, depending on completeness).86.722%
AQUATECH - DIEM GMBH scores 0.0 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
x
CriterionValueWeight
  • Website authority: Ahrefs' Domain Rating measures, on a scale of 0 to 100, how strongly a website is linked from other websites. For Swiss SMEs the range up to 40 is typical; the maximum is reached at 35.0.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%

The data basis is 54%, below the threshold at which ranQ publishes a score. Evidence is missing for: Review quality, Review volume, Review recency, Media authority. As of November 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

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Location

Industriestrasse 15
9015 St. Gallen
Opening hours
Mon
08:00 - 17:00
Tue
08:00 - 17:00
Wed
08:00 - 17:00
Thu
08:00 - 17:00
Fri
08:00 - 15:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Limited Liability Company
UID
CHE-114.941.317
Founded
2009 · 17 years
Last commercial register change
August 13, 2018
Employees
1 to 10

Active in 1 of 26 cantons · 1 municipality

  • SGSt. Gallen
Legal form: Graded by liability and disclosure. The weight is kept small: a sole proprietorship is not a dubious company, it is just liable differently.
88.0
6%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.70.03%
    • Full methodology

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