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

About the company

The core activity of Kieffer AG is the planning, calculation and execution of sanitary installations, heating systems and related services such as repairs, renovations and refurbishments in the field of building technology.

AI-generated
Offering

Products & services

Industry:Plumbing & Building Services
✓ Offered6
Sanitary facilities and bathrooms
Sanitary installations and bathroom renovations, advice, design, project planning and professional installation for new builds, renovations, owner-occupied homes, rental properties and public buildings.
Heating systems and district heating
Heating systems for new builds, renovations and conversions, including heat pumps, wood and pellet heating systems, district heating, gas and oil heating systems as well as solar systems, underfloor heating and radiators.
Ventilation systems
Centralized and decentralized ventilation systems for new builds and renovations, with fresh air supply, moisture protection, heat recovery and improved indoor climate.
Repair and maintenance service
Repairs and maintenance work on plumbing and heating systems, including troubleshooting, regular inspections and on-site service.
Boiler and water heater descaling
Mechanical and chemical descaling of boilers and water heaters to maintain efficiency, reduce energy consumption and prevent consequential damage.
Water treatment
Water treatment and limescale protection through water softening with softening systems and ion exchange to remove hardness-forming substances.
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4.4/5

Kieffer AG

Trust & reputation

ranQ Trust Score of Kieffer AG: 4.4 out of 5.0

Trust Score4.4/ 5.0

Very high

x

Data basis 96% · As of October 2026

Kieffer AG scores 84.6 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.81.924%
  • 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.78.610%
  • 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.100.08%
Kieffer AG 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%
Kieffer AG scores 83.3 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).83.322%
Kieffer AG scores 6.3 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 35.6.34%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Kieffer AG reaches a ranQ Trust Score of 4.4 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.8 out of 5 stars from 21 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
4.8
of 5

Aggregated from 21 reviews across all connected sources

Sources
GGoogle4.821
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Comparisons

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Location

Birkenweg 23
5303 Würenlingen
Opening hours
Mon
07:30 - 12:00, 13:00 - 17:00
Tue
07:30 - 12:00, 13:00 - 17:00
Wed
07:30 - 12:00, 13:00 - 17:00
Thu
07:30 - 12:00, 13:00 - 17:00
Fri
07:30 - 12:00, 13:00 - 15:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-112.639.020
Founded
2005 · 21 years
Last commercial register change
June 15, 2009
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.
100.0
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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