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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryCrafts & TradesPlumbing & Building ServicesGümligenMarkus Keller GmbH
Markus Keller GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Markus Keller GmbH is the planning, installation, maintenance and repair of sanitary and heating systems, including solar systems and water treatment, for private and business customers in the greater Bern area. This also includes emergency and renovation services as well as the coordination of construction projects and renovation measures.

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Products & services

Industry:Plumbing & Building Services
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4.3/5

Markus Keller GmbH

9
Sanitary installations
Cold and hot water supply, house connections and drainage, supply and installation of fixtures, new builds and conversions, repairs and maintenance.
Bathroom renovation
Bathroom redesign, bathroom conversion and renovation, from advice and planning through execution and final cleaning in one package.
Heating installations
Heating installation, heating renovation and heating replacement, with advice on efficiency, ecology, subsidies and suitable heating systems.
Heat pumps
Heat pumps for new installation and replacement, including heating system selection, planning and professional implementation in air-to-water or ground-source solutions.
Heating system replacement
Replacement of oil and gas heating systems, heating renovation and conversion to suitable systems, with advice on subsidies and efficiency.
Thermal solar systems
Thermal solar systems for domestic hot water and heating support, including planning, installation and maintenance for buildings in the Bern region.
Water treatment
Water treatment with installation, renovation and repair of systems, descaling and softening equipment for hot and drinking water.
Boiler descaling
Boiler descaling to reduce energy consumption and extend service life, as a standalone service within water treatment.
Emergency plumbing service
24-hour emergency plumbing service for blockages, pipe bursts and water damage, with no weekend or holiday surcharges.
Trust & reputation

ranQ Trust Score of Markus Keller GmbH: 4.3 out of 5.0

Trust Score4.3/ 5.0

Very high

x

Data basis 96% · As of October 2026

Markus Keller GmbH scores 77.5 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.83.324%
  • 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.63.210%
  • 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.78.08%
Markus Keller GmbH scores 86.7 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.70.07%
Markus Keller 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%
Markus Keller GmbH scores 4.3 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 35.4.34%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Markus Keller GmbH reaches a ranQ Trust Score of 4.3 out of 5.0 — rated «Very high». The rating draws, among other things, on 5.0 out of 5 stars from 11 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 11 reviews across all connected sources

Sources
GGoogle511
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Location

Holzackerweg 15
3073 Gümligen
Opening hours
Mon
08:00 - 12:00, 13:30 - 17:00
Tue
08:00 - 12:00, 13:30 - 17:00
Wed
08:00 - 12:00, 13:30 - 17:00
Thu
08:00 - 12:00, 13:30 - 17:00
Fri
08:00 - 12:00, 13:30 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Limited Liability Company
UID
CHE-100.145.395
Founded
2005 · 21 years
Last commercial register change
March 18, 2014
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.
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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