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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryEnergy & EnvironmentSolar & PhotovoltaicsHolzikenHeizung-Sanitär R. Müller GmbH
Heizung-Sanitär R. Müller GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Heizung-Sanitär R. Müller GmbH is the planning, execution and maintenance of building technology systems, particularly in the areas of heating, sanitation, air conditioning, ventilation and solar systems. This also includes emergency services, repairs and renovations. The company also offers consulting and conception services for the optimal equipment of buildings with building technology systems.

AI-generated
Offering

Products & services

Industry:Solar & Photovoltaics
✓ Offered12
Heating systems
Consulting, design and installation of heating systems, including planning and execution of heating work.
Sanitary installations
Consulting and execution of sanitary installations, including work around the bathroom and all sanitary work.
Heat pumps
Planning, procurement, installation, commissioning and maintenance of heat pumps.
Solar systems
Planning and use of solar systems for energy generation.
24/7 Emergency service
Emergency service around the clock, 365 days a year, also outside opening hours, on weekends and public holidays.
Boiler descaling
Regular maintenance of boilers with descaling and inspection of the sacrificial anode.
Ventilation
Acquisition, maintenance and supervision of ventilation systems of all kinds for a good indoor climate.
Repairs
Repair service for appliances and installations so systems can be used for as long as possible.
Drain cleaning
Periodic cleaning of drains as well as service for clogged drains in emergencies.
Water softening systems
Advice on water softening systems for hard, limestone water and their benefits in everyday life and in costs.
Laundry and kitchen appliances
Consulting, installation and maintenance of washing machines, dryers and kitchen appliances.
Alterations
Alterations in the field of building services with solutions for various issues and adjustments to existing systems.
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4.2/5

Heizung-Sanitär R. Müller GmbH

Trust & reputation

ranQ Trust Score of Heizung-Sanitär R. Müller GmbH: 4.2 out of 5.0

Trust Score4.2/ 5.0

Very high

x

Data basis 96% · As of October 2026

Heizung-Sanitär R. Müller GmbH scores 78.0 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.80.424%
  • 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.72.110%
  • 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.78.08%
Heizung-Sanitär R. Müller GmbH scores 83.0 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%
Heizung-Sanitär R. Müller GmbH 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%
Heizung-Sanitär R. Müller GmbH scores 5.7 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 35.5.74%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Heizung-Sanitär R. Müller GmbH reaches a ranQ Trust Score of 4.2 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.8 out of 5 stars from 16 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 16 reviews across all connected sources

Sources
GGoogle4.816
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Hauptstrasse 10
5043 Holziken
Opening hours
Mon
24h
Tue
24h
Wed
24h
Thu
24h
Fri
24h
Sat
24h
Sun
24h

At a glance

Legal form
Limited Liability Company
UID
CHE-114.493.661
Founded
2008 · 18 years
Last commercial register change
May 30, 2016
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.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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