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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,937 companies indexed · Last updated: today
DirectoryEnergy & EnvironmentSolar & PhotovoltaicsNiederwil SgKeller Gebäudetechnik GmbH
Keller Gebäudetechnik GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Keller Gebäudetechnik GmbH provides planning, installation and maintenance of heating systems, including air‑to‑water and ground‑probe heat pumps, wood‑fired heating, thermal solar systems and gas and oil heating solutions.

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Products & services

Industry:Solar & Photovoltaics
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4.4/5

Keller Gebäudetechnik GmbH

8
Heating systems
Heating solutions for new builds, conversions, renovations and service; consulting, planning, installation and maintenance of systems for buildings.
Air-to-water heat pumps
Heat pumps that extract heat from the outdoor air and heat water for space heating and domestic hot-water production; suitable for new builds and renovations.
Ground-source heat pumps
Heat pumps that use geothermal heat from the ground to heat and cool buildings; suitable for new builds and renovations.
Solar thermal systems
Solar systems for heating water or heating fluid for heating support and domestic hot-water production; with collectors, storage tanks and control systems.
Wood heating systems
Wood heating systems for firewood, pellets or wood chips; for space heating and domestic hot water in single-family homes, multi-family buildings as well as commercial and industrial properties.
Gas and oil heating systems
Conventional heating systems with natural gas or heating oil for residential and commercial properties; suitable for new builds, modernization and combination with solar thermal.
Bivalent heating
Combined heating systems with two energy sources, such as a heat pump and a gas or oil heating system, or solar thermal and a wood boiler.
Heat distribution
Heat distribution systems for heating, such as radiators, underfloor heating and ceiling radiant panels, for different buildings and room uses.
Trust & reputation

ranQ Trust Score of Keller Gebäudetechnik GmbH: 4.4 out of 5.0

Trust Score4.4/ 5.0

Very high

x

Data basis 96% · As of October 2026

Keller Gebäudetechnik GmbH scores 90.9 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.90.524%
  • 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.84.710%
  • 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%
Keller Gebäudetechnik GmbH scores 77.2 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.86.512%
  • 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%
Keller Gebäudetechnik GmbH scores 83.3 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).83.322%
Keller Gebäudetechnik GmbH scores 7.4 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 35.7.44%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Keller Gebäudetechnik GmbH reaches a ranQ Trust Score of 4.4 out of 5.0 — rated «Very high». The rating draws, among other things, on 5.0 out of 5 stars from 27 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 27 reviews across all connected sources

Sources
GGoogle527
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Flawilerstrasse 8
9203 Niederwil Sg
Opening hours
Mon
07:30 - 17:30
Tue
07:30 - 17:30
Wed
07:30 - 17:30
Thu
07:30 - 17:30
Fri
07:30 - 17:30
Sat
Closed
Sun
Closed

At a glance

Legal form
Limited Liability Company
UID
CHE-399.270.490
Founded
2016 · 10 years
Last commercial register change
January 13, 2026
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.
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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