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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,937 companies indexed · Last updated: today
DirectoryCrafts & TradesPlumbing & Building ServicesSulgenWittwer Heizungen AG
Wittwer Heizungen AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Wittwer Heizungen AG consists of planning, installing and maintaining heating systems, including renewable energies and conventional heating systems, as well as carrying out heating renovations, conversions and repairs.

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Products & services

Industry:Plumbing & Building Services
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Wittwer Heizungen AG

Heating planning and heating installation
Advice, planning and execution of new heating systems, including new builds, conversions, heating refurbishments as well as modifications and extensions to existing systems.
Heating refurbishments
Refurbishment of existing heating systems with replacement, modernisation and adaptations to the building and energy requirements, including funding and MuKEn-related advice.
Heat pump heating systems
Heat pump heating systems in air/water and brine/water configurations, tailored to new builds and refurbishments, using renewable energy sources.
Gas heating systems
Natural gas and biogas heating systems with condensing technology, primarily for refurbishments, with high flow temperatures and cost-effective operation.
Oil heating systems
Oil heating systems and condensing units with efficient heating technology, suitable for high flow temperatures and combinable with heat pumps.
Wood heating systems
Wood pellet heating systems, log heating systems and wood chip heating systems as regional, CO₂-neutral heat supply with different fuel types and operating modes.
District heating connections
Connection to district heating for buildings without their own heating system, with centrally generated heat and minimal maintenance.
Heat distribution systems
Radiator heating, underfloor heating, air heaters and ceiling radiant panels as heat distribution for residential and commercial properties.
Underfloor heating
Surface heating in various systems for modern buildings, invisible and low-maintenance compared with radiators.
Radiator heating
Radiators and heating walls in various designs, also suitable for wet rooms and usable as design elements.
Air heaters
Air heaters for halls and workshops with fast warm-up time, optional cooling and filtered recirculated air.
Ceiling radiant panels
Ceiling radiant panels for hall heating with uniform infrared heat and low dust suspension.
Trust & reputation

ranQ Trust Score of Wittwer Heizungen AG: 4.2 out of 5.0

Trust Score4.2/ 5.0

Very high

x

Data basis 96% · As of October 2026

Wittwer Heizungen AG scores 73.2 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.78.124%
  • 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.49.510%
  • 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.88.08%
Wittwer Heizungen 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%
Wittwer Heizungen AG scores 83.3 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).83.322%
Wittwer Heizungen AG scores 5.4 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 35.5.44%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Wittwer Heizungen AG reaches a ranQ Trust Score of 4.2 out of 5.0 — rated «Very high». The rating draws, among other things, on 5.0 out of 5 stars from 6 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
5
of 5

Aggregated from 6 reviews across all connected sources

Sources
GGoogle56
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Kradolfstrasse 84
8583 Sulgen
Opening hours
Mon
07:30 - 12:00, 13:30 - 17:00
Tue
07:30 - 12:00, 13:30 - 17:00
Wed
07:30 - 12:00, 13:30 - 17:00
Thu
07:30 - 12:00, 13:30 - 17:00
Fri
07:30 - 12:00, 13:30 - 16:30
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-107.081.891
Founded
1989 · 37 years
Last commercial register change
April 8, 2015
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.
100.0
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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