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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureSpecialized Construction ActivitiesFlaachGraf Heizung und Sanitär AG
Graf Heizung und Sanitär AG Logo
Verified· 4 sourcesTrust Score
Summary

About the company

The core activity of the company "Graf Heizung und Sanitär AG" encompasses the following areas: Sanitary: consulting, planning and execution of bathroom renovations as well as smaller sanitary works; Heating: installation and maintenance of heating systems; Water supply: installation of house connections and transport lines for municipal utilities. The company thus offers services in the field of building technology and installation.

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Products & services

Industry:Specialized Construction ActivitiesPlumbing & Building Services
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3.9/5

Graf Heizung und Sanitär AG

✓ Offered3
Heating systems
New builds, repairs and renovations of heating systems; wood-chip heating systems, geothermal borehole drilling and other types of heating in cooperation with partners.
Sanitary installations
New builds, bathroom renovations, repairs and installations in the sanitary sector; support and advice for leaking fittings, complete new builds and conversions.
Water supply
Service connections up to large transport pipelines for municipalities; installation using cast iron or PE, as well as welding of high-pressure plastic pipes.
Trust & reputation

ranQ Trust Score of Graf Heizung und Sanitär AG: 3.9 out of 5.0

Trust Score3.9/ 5.0

High

x

Data basis 100% · As of October 2026

Graf Heizung und Sanitär AG scores 60.6 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.68.824%
  • 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.49.510%
  • 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.50.08%
Graf Heizung und Sanitär 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%
Graf Heizung und Sanitär AG scores 86.7 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).86.722%
Graf Heizung und Sanitär AG scores 14.6 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 35.9.14%
  • 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

Graf Heizung und Sanitär AG reaches a ranQ Trust Score of 3.9 out of 5.0 — rated «High». The rating draws, among other things, on 4.5 out of 5 stars from 6 customer reviews. As of October 2026.

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

Reviews

Aggregated rating

Aggregated rating
4.5
of 5

Aggregated from 6 reviews across all connected sources

Sources
GGoogle4.56
★TrustpilotSoon
PProvenExpertSoon

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

Press

Media

December 4, 2025Media
Traditionsbetrieb Märki geht an die Graf-Gruppe
aargauerzeitung.ch

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Location

Strehlgasse 4
8416 Flaach
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 - 16:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-106.479.469
Founded
1989 · 37 years
Last commercial register change
January 12, 2012
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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