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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryCrafts & TradesPlumbing & Building ServicesKleinandelfingenU. Aerne
U. Aerne Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of U. Aerne, Sanitär Heizung, encompasses the planning, installation, maintenance, and repair of sanitary facilities, heating systems, industrial pipes, and solar systems. This includes, in particular: Sanitary installations in new buildings and renovations; Heating systems, including boiler replacements and system changes from oil heating to heat pumps; Bathroom renovations; Repair services for sanitary facilities and heating systems; Boiler descaling and pipe cleaning; Core drilling in concrete and flushing of piping systems; Installation and maintenance of solar systems and heat pumps; Energy consulting and optimization, including the use of thermal imaging cameras for leak detection and energy loss analysis.

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Offering

Products & services

Industry:Plumbing & Building Services
✓ Offered10
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3.9/5

U. Aerne

Sanitary and heating installations
Professional installations in the field of plumbing / service lines and heating, including bathroom conversions as well as advice on systems and products.
Repairs and maintenance
Repairs to sanitary and heating systems as well as general maintenance work around service lines and installations.
Boiler descaling
Descaling of boilers for maintenance and ensuring the proper operation of hot-water systems.
Pipe cleaning
Cleaning of pipes and lines to clear blockages and ensure proper drain operation.
Core drilling
Core drilling for installations and pipe routing in the context of sanitary and heating work.
Bathroom conversions
Conversions of bathrooms, including adjustments in the sanitary sector and installation of the required systems.
Heat-pump boilers
Supply and installation of heat-pump boilers for domestic hot-water production.
Heat pump heating systems
Planning and installation of heat pump heating systems for energy-efficient heating systems.
Energy-saving circulation pumps
Consulting and quotes for energy-saving circulation pumps as a replacement for conventional heating circulation pumps.
Quooker boiling-water taps
Offer of boiling-water taps for cold, warm and boiling water in the kitchen.
Trust & reputation

ranQ Trust Score of U. Aerne: 3.9 out of 5.0

Trust Score3.9/ 5.0

High

x

Data basis 96% · As of October 2026

U. Aerne scores 56.5 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.68.224%
  • 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.17.610%
  • 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%
U. Aerne scores 78.5 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%
U. Aerne scores 85.0 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).85.022%
U. Aerne scores 2.0 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 35.2.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

U. Aerne reaches a ranQ Trust Score of 3.9 out of 5.0 — rated «High». The rating draws, among other things, on 5.0 out of 5 stars from 1 customer reviews. The data basis is 96%, so the score is backed by part of the criteria. As of October 2026.

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

Reviews

Aggregated rating

Aggregated rating
5
of 5

Aggregated from 1 reviews across all connected sources

Sources
GGoogle51
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Location

Hirstigweg 3
8451 Kleinandelfingen
Opening hours
Mon
24h
Tue
24h
Wed
24h
Thu
24h
Fri
24h
Sat
24h
Sun
24h

At a glance

Legal form
Sole proprietorship
UID
CHE-103.917.237
Founded
1987 · 39 years
Last commercial register change
August 22, 2001
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.
67.0
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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