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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,765 companies indexed · Last updated: today
DirectoryCrafts & TradesPlumbing & Building ServicesDietikonVaillant GmbH
Vaillant GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Vaillant is the development, manufacture and distribution of heating systems and technologies, including heat pumps, gas heating systems, solar systems, hot water storage tanks and heating controls, as well as the provision of services such as maintenance, service and consulting in the field of heating technology.

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Products & services

Industry:Plumbing & Building Services
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4.3/5

Vaillant GmbH

✓ Offered9
Heat pumps
Heat pumps for single-family homes and multi-family homes / commercial buildings; air/water, brine/water and domestic hot water heat pumps, installed indoors or outdoors, with cooling function and app control.
Gas heating systems
Gas heating systems for new builds and refurbishment; wall-mounted heaters, condensing boilers and gas instantaneous water heaters for single- and multi-family homes as well as commercial buildings.
Solar thermal systems
Solar thermal systems and solar collectors for domestic hot water and heating support; solutions for single-family homes and multi-family homes, with flush-roof (integrated), roof-mounted and other installation options.
Hot water storage tanks
Hot water storage tanks and storage solutions for gas, oil and heat pump systems; including solar storage tanks, multi-function storage tanks and hot water heat pumps.
Heating controllers
Controllers and communication systems for heating control via smartphone or tablet; including an internet communication module and system controllers for heating and solar installations.
Service services
Maintenance, repair and troubleshooting, commissioning and warranty services for heating systems; as well as digital services and a service portal.
Service contracts
Service contracts with regular maintenance and inspections, coverage in the event of breakdowns, and digital services; available in BASIC, STANDARD and PREMIUM.
Customer service (Service-Hotline)
Telephone customer service and contact by e-mail or contact form for heating questions, faults and service requests.
Heating consultation and planning
Consulting for selecting and planning the suitable heating system, in particular heat pumps; including information on modernization, new builds, subsidies and financing.
Trust & reputation

ranQ Trust Score of Vaillant GmbH: 4.3 out of 5.0

Trust Score4.3/ 5.0

Very high

x

Data basis 96% · As of October 2026

Vaillant GmbH scores 64.1 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.37.224%
  • 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.100.08%
Vaillant GmbH scores 91.7 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.90.07%
Vaillant 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%
Vaillant GmbH scores 100.0 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 35.100.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Vaillant GmbH reaches a ranQ Trust Score of 4.3 out of 5.0 — rated «Very high». The rating draws, among other things, on 3.7 out of 5 stars from 124 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
3.7
of 5

Aggregated from 124 reviews across all connected sources

Sources
GGoogle3.7124
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Riedstrasse 12
8953 Dietikon
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 - 15:30
Sat
Closed
Sun
Closed

At a glance

Legal form
Limited Liability Company
UID
CHE-107.980.447
Founded
1980 · 46 years
Last commercial register change
July 28, 2022
Employees
51 to 100
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.
88.0
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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