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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryCrafts & TradesPlumbing & Building ServicesZurichH2O Haustechnik AG
H2O Haustechnik AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of H2O Haustechnik AG is the planning, installation, maintenance and repair of building technology systems, particularly in the areas of: Sanitary: installation and maintenance of sanitary facilities; Heating: planning and installation of heating systems, including oil heating, solar systems and heat pumps; Ventilation: installation and maintenance of ventilation systems to improve indoor climate and well-being. The company also offers consulting services to support customers in selecting and implementing energy-efficient and ecological solutions.

AI-generated
Offering

Products & services

Industry:Plumbing & Building ServicesSpecialized Construction Installations
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H2O Haustechnik AG

✓ Offered4
Sanitary engineering
Sanitary installations, water treatment and water supply, wastewater engineering, compressed air systems, gas installations, as well as installations in new builds and renovations, refurbishment of existing installations and bathroom renovations.
Heating systems
Systems for new builds and renovations, refurbishment of existing systems, solar installations, heat pumps, oil heating systems, log wood heating, district heating supply, heat recovery and heat distribution systems.
Ventilation systems
Ventilation installations in new builds and renovations, refurbishment of existing installations, controlled residential ventilation systems as well as bathroom and kitchen extract ventilation for rooms, buildings and technical installations.
Advisory, planning and service & repair
Personal advice, overall management of project and execution planning as well as maintenance work, conversions and repair service for defective lines, clogged pipes and heating failures.
Trust & reputation

ranQ Trust Score of H2O Haustechnik AG: 4.2 out of 5.0

Trust Score4.2/ 5.0

Very high

x

Data basis 96% · As of October 2026

H2O Haustechnik AG scores 69.3 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.72.524%
  • 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.61.010%
  • 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.70.08%
H2O Haustechnik AG scores 89.3 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.70.07%
H2O Haustechnik 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%
H2O Haustechnik AG scores 6.0 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 35.6.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

H2O Haustechnik AG reaches a ranQ Trust Score of 4.2 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.6 out of 5 stars from 10 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
4.6
of 5

Aggregated from 10 reviews across all connected sources

Sources
GGoogle4.610
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Fuchsiastrasse 14
8048 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 - 15:30
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-111.695.719
Founded
2004 · 22 years
Last commercial register change
May 7, 2018
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.
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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