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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryCrafts & TradesSpecialized Construction InstallationsKehrsatzZwygart-Nafzger Wärmetechnik AG
Zwygart-Nafzger Wärmetechnik AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The company's core activity is the installation, maintenance, repair and renovation of heating systems, particularly oil burners, boilers, heat pumps and radiators, as well as the installation of solar systems and the execution of chimney renovations.

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Products & services

Industry:Specialized Construction Installations
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Zwygart-Nafzger Wärmetechnik AG

4
Heating installations
Heat pumps, oil-fired heating systems, gas heating systems, hot-water storage tanks, radiators and underfloor heating; installations for heating systems and alternative heating solutions.
Service, maintenance and repairs
Oil burner service, burner maintenance, hot-water tank inspections, replacement or repair of heating controllers, leak tests and repairs to heating systems.
Heating refurbishments
Partial and full refurbishments of heating systems, including replacement of oil burners, heating boilers with or without hot-water tanks, replacement of radiators and chimney refurbishments.
Water treatment
Installation and service of water treatment and water softening systems to protect pipes, hot-water tanks and appliances.
Trust & reputation

ranQ Trust Score of Zwygart-Nafzger Wärmetechnik AG: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 96% · As of October 2026

Zwygart-Nafzger Wärmetechnik AG scores 64.3 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.72.124%
  • 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.40.910%
  • 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%
Zwygart-Nafzger Wärmetechnik 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%
Zwygart-Nafzger Wärmetechnik 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%
Zwygart-Nafzger Wärmetechnik AG scores 8.6 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 35.8.64%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Zwygart-Nafzger Wärmetechnik AG reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». The rating draws, among other things, on 4.8 out of 5 stars from 4 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 4 reviews across all connected sources

Sources
GGoogle4.84
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Location

Selhofen 44
3122 Kehrsatz
Opening hours
Mon
24h
Tue
24h
Wed
24h
Thu
24h
Fri
24h
Sat
24h
Sun
24h

At a glance

Legal form
Corporation
UID
CHE-108.826.168
Founded
1998 · 28 years
Last commercial register change
September 26, 2023
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.100.06%
  • 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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