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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryCrafts & TradesPlumbing & Building ServicesMarbach SgDeiss und Deiss Installationstechnik GmbH
Deiss und Deiss Installationstechnik GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Deiss and Deiss Installationstechnik GmbH is the planning, installation and servicing of sanitary, heating and solar systems.

AI-generated
Offering

Products & services

Industry:Plumbing & Building Services
✓ Offered10
Sanitary installations
Sanitary installations for new builds and conversions, bathroom refurbishments, water softening systems and water treatment, shower toilets as well as rainwater harvesting systems.
Heating systems
Heat pumps, cooling systems, wood and pellet heating units, as well as upgrading and optimising fossil heating systems.
Energy optimisation
Analysis of existing systems, optimisation concepts with intelligent control and hydraulic balancing, advice on reducing consumption and costs.
Photovoltaics
Consulting, design and installation of photovoltaic systems including grid connection and storage options.
Air-conditioning systems
Air-conditioning systems for apartments, single-family homes and smaller commercial areas, tailored to the specific room situation.
Ventilation systems
Central and decentral ventilation systems with heat recovery for new builds and refurbishments.
Maintenance of heating systems
Maintenance packages for heating and sanitary systems to ensure durability and operational reliability.
Maintenance and descaling of water heaters
Maintenance and professional descaling of water heaters to prevent malfunctions and damage.
Sanitary installation service
Repairs, modernisations and service work related to sanitary installations, for example for dripping taps or defective pipework.
Special installations
Tailor-made systems for industry, trade or special structural conditions.
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4.1/5

Deiss und Deiss Installationstechnik GmbH

Trust & reputation

ranQ Trust Score of Deiss und Deiss Installationstechnik GmbH: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 96% · As of October 2026

Deiss und Deiss Installationstechnik GmbH scores 67.6 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.65.024%
  • 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.72.110%
  • 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%
Deiss und Deiss Installationstechnik GmbH scores 83.0 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%
Deiss und Deiss Installationstechnik 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%
Deiss und Deiss Installationstechnik GmbH scores 22.9 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 35.22.94%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Deiss und Deiss Installationstechnik GmbH reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». The rating draws, among other things, on 4.3 out of 5 stars from 16 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
4.3
of 5

Aggregated from 16 reviews across all connected sources

Sources
GGoogle4.316
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Comparisons

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Location

Staatsstrasse 16
9437 Marbach Sg
Opening hours
Mon
07:00 - 12:00, 13:00 - 17:00
Tue
07:00 - 12:00, 13:00 - 17:00
Wed
07:00 - 12:00, 13:00 - 17:00
Thu
07:00 - 12:00, 13:00 - 17:00
Fri
07:00 - 12:00, 13:00 - 16:30
Sat
Closed
Sun
Closed

At a glance

Legal form
Limited Liability Company
UID
CHE-115.635.248
Founded
2010 · 16 years
Last commercial register change
January 27, 2025
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.88.06%
  • 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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