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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryCrafts & TradesPlumbing & Building ServicesZurichGuyer Wärme und Wasser AG
Guyer Wärme und Wasser AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Guyer Wärme und Wasser AG provides building services engineering for heating, cooling and sanitary systems, including planning, maintenance and customer service.

AI-generated
Offering

Products & services

Industry:Plumbing & Building Services
✓ Offered4
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Guyer Wärme und Wasser AG

Heating and cooling engineering
Heating, cooling and ventilation systems for new builds and refurbishments, with consulting, planning, installation, maintenance and 24-hour service.
Sanitary installations
Sanitary installations for new builds and refurbishments, including drinking water, wastewater and gas installations, compressed air systems, plus bathroom conversions and wellness bathrooms.
Customer service and maintenance
Customer service with repairs, maintenance, service and warranty contracts, 24-hour on-call support, remote monitoring, water damage remediation, water quality and boiler maintenance.
Building services engineering planning
Planning of energy and building services systems in heating, cooling, sanitary and ventilation, with energy consulting, energy concepts, expert reports, thermography and condition assessments.
Trust & reputation

ranQ Trust Score of Guyer Wärme und Wasser AG: 4.5 out of 5.0

Trust Score4.5/ 5.0

Excellent

x

Data basis 96% · As of October 2026

Guyer Wärme und Wasser AG scores 81.5 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.69.324%
  • 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.100.010%
  • 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%
Guyer Wärme und Wasser AG scores 92.3 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.82.07%
Guyer Wärme und Wasser AG 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%
Guyer Wärme und Wasser AG scores 51.4 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 35.51.44%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Guyer Wärme und Wasser AG reaches a ranQ Trust Score of 4.5 out of 5.0 — rated «Excellent». The rating draws, among other things, on 4.4 out of 5 stars from 58 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 58 reviews across all connected sources

Sources
GGoogle4.458
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Comparisons

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Location

Zürichbergstrasse 80
8044 Zurich
Opening hours
Mon
07:00 - 12:00, 13:00 - 17:00
Tue
07:00 - 12:00, 13:00 - 17:00
Wed
07:00 - 12:00, 13:00 - 17:00
Thu
07:00 - 12:00, 13:00 - 17:00
Fri
07:00 - 12:00, 13:00 - 16:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-105.968.642
Founded
1971 · 55 years
Last commercial register change
June 19, 2026
Employees
21 to 50
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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