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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,937 companies indexed · Last updated: today
DirectoryCrafts & TradesPlumbing & Building ServicesSteinachDupper Sanitär und Heizung GmbH
Dupper Sanitär und Heizung GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Dupper Sanitär und Heizung GmbH is a plumbing and heating craft company that provides planning, installation and maintenance services for bathrooms and heating systems. Services listed on the website include 3D bathroom planning, renovations and new-build installations for residential and industrial buildings, water treatment and softening, boilers, heat pumps, solar systems and service calls.

AI-generated
Offering

Products & services

Industry:Plumbing & Building Services
✓ Offered3
Sanitary installations
Bathroom planning in 3D, bathroom conversions, new builds for single-family homes, multi-family homes and industry, renovations, property maintenance, water softening, water treatment, water heaters/boilers, rainwater harvesting, experience showers and shower toilets.
Heating installations
New builds and conversions for single-family homes, multi-family homes and industry, renovations, property maintenance, gas heating systems, oil heating systems, heat pumps, air-to-water heat pumps and comfort ventilation systems.
Service
Service for sanitary and heating systems, reachable by phone for faults and all cases around the clock.
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4.1/5

Dupper Sanitär und Heizung GmbH

Trust & reputation

ranQ Trust Score of Dupper Sanitär und Heizung GmbH: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 96% · As of October 2026

Dupper Sanitär und Heizung GmbH scores 69.0 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.67.124%
  • 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.52.910%
  • 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.95.08%
Dupper Sanitär und Heizung GmbH scores 86.7 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.70.07%
Dupper Sanitär und Heizung GmbH 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%
Dupper Sanitär und Heizung GmbH scores 8.9 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 35.8.94%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Dupper Sanitär und Heizung GmbH 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 7 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
4.4
of 5

Aggregated from 7 reviews across all connected sources

Sources
GGoogle4.47
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Hauptstrasse 46
9323 Steinach
Opening hours
Mon
07:00 - 17:00
Tue
07:00 - 17:00
Wed
07:00 - 17:00
Thu
07:00 - 17:00
Fri
07:00 - 16:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Limited Liability Company
UID
CHE-101.695.907
Founded
2001 · 25 years
Last commercial register change
January 15, 2025
Employees
11 to 20
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.88.06%
  • 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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