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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryCrafts & TradesMetal ConstructionWaldkirchAerni AG Maschinen- und Anlagenbau
Aerni AG Maschinen- und Anlagenbau Logo
Verified· 4 sourcesTrust Score
Summary

About the company

The core activity of Aerni AG includes the development, manufacture and maintenance of steam systems, the production of complex welded structures, as well as CNC machining of individual parts and small series.

AI-generated
Offering

Products & services

Industry:Metal Construction
✓ Offered8
Steam Boiler Systems
Planning, manufacture, installation and commissioning of turnkey steam systems, including shell boilers, high-speed steam generators, electric steam generators and mobile or containerised systems.
Steam Service
Maintenance, repair, conversion and operational service for steam boiler plants, including inspections, service packages, monitoring, spare parts and on-call support.
Contract Manufacturing of Assemblies
Planning, manufacture and installation of welded assemblies for steam systems, process industry, vehicle construction and mechanical engineering, including design, welding and on-site installation.
CNC Machining
Turning and milling of precision parts and small batches, including material procurement, heat and surface treatment, marking and production to specification.
Pressure Vessel Construction
Manufacture of pressure vessels in steel and stainless steel according to CE1253, including customer-specific design, fittings and heat recovery integration.
Pipeline Construction for Steam, Condensate and Hot Water
Installation of steam and condensate piping, including boiler-house piping, peripheral piping and additional lines for gas, oil and fresh water.
Steam Plant Operation Service
Monitoring and operation of steam boiler systems, including regular technician visits, maintenance and remote supervision of critical components.
Steam Measurement Services
Invasive and non-invasive steam-consumption measurement, permanent or rented, to size pipelines correctly, select boiler size and improve system efficiency.
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4.1/5

Aerni AG Maschinen- und Anlagenbau

Trust & reputation

ranQ Trust Score of Aerni AG Maschinen- und Anlagenbau: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 100% · As of October 2026

Aerni AG Maschinen- und Anlagenbau scores 65.8 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
x
CriterionValueWeight
  • Review quality: The average rating across all connected sources, smoothed against the industry mean. So 5.0 stars from three reviews do not outrank 4.7 from three hundred.67.424%
  • Review volume: The number of reviews across all sources. The scale is logarithmic: the first reviews count the most, and the maximum is reached at 50 reviews.58.610%
  • Review recency: The age of the most recent review. Two-year-old reviews deliberately sit in the middle, because that is normal for Swiss SMEs. Only after three years without a new voice does the value drop markedly.70.08%
Aerni AG Maschinen- und Anlagenbau scores 85.5 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%
Aerni AG Maschinen- und Anlagenbau scores 85.0 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
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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).85.022%
Aerni AG Maschinen- und Anlagenbau scores 44.3 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 35.68.64%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.20.04%
Qualifications+0.00

Aerni AG Maschinen- und Anlagenbau reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». The rating draws, among other things, on 4.4 out of 5 stars from 9 customer reviews. As of October 2026.

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

Reviews

Aggregated rating

Aggregated rating
4.4
of 5

Aggregated from 9 reviews across all connected sources

Sources
GGoogle4.49
★TrustpilotSoon
PProvenExpertSoon

Further sources are added continuously and factored into the ranQ Rating.

Press

Media

March 9, 2020Media
Aerni AG findet Nachfolgelösung
leaderdigital.ch
March 9, 2020Media
Aerni AG findet erfolgreich eine Nachfolgelösung
organisator.ch

Knowledge

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Comparisons

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Location

Brüelstrasse 8
9205 Waldkirch
Opening hours
Mon
07:00 - 12:00, 13:30 - 17:00
Tue
07:00 - 12:00, 13:30 - 17:00
Wed
07:00 - 12:00, 13:30 - 17:00
Thu
07:00 - 12:00, 13:30 - 17:00
Fri
07:00 - 12:00, 13:30 - 16:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-107.120.321
Founded
1993 · 33 years
Last commercial register change
December 6, 2021
Employees
1 to 10
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.100.06%
  • 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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