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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryCrafts & TradesPlumbing & Building ServicesFlawilSeiz Haus- und Industrietechnik AG
Seiz Haus- und Industrietechnik AG Logo
Verified· 4 sourcesTrust Score
Summary

About the company

The core activity of Seiz AG includes the planning, installation and maintenance of heating systems, ventilation systems, pipelines, as well as the use of renewable energies. The company also offers a 24-hour emergency service and advises customers on the renovation of heating systems and the simplification of decision-making bases.

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Offering

Products & services

Industry:Plumbing & Building Services
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4.2/5

Seiz Haus- und Industrietechnik AG

✓ Offered5
Heating Systems
Planning and installation of oil, gas and alternative heating systems for new builds and refurbishments, from single-family homes to large industrial buildings; service support for operation and maintenance.
Ventilation Systems
Planning of ventilation and air-conditioning systems for residential buildings and industry; demand-controlled ventilation, fresh-air supply and individual solutions for temperature and humidity requirements.
Piping Construction
Calculation, planning and professional installation of piping systems for various media with manifolds, pumps and fittings; pipes in stainless steel, black steel and plastic.
Renewable Heating Systems
Alternative heating systems based on renewable energy sources, including heat pumps and solar collectors for domestic hot water and heating support.
24-hour On-call Service
24/7 on-call service with short response times for faults in heating systems, piping and ventilation systems.
Trust & reputation

ranQ Trust Score of Seiz Haus- und Industrietechnik AG: 4.2 out of 5.0

Trust Score4.2/ 5.0

Very high

x

Data basis 100% · As of October 2026

Seiz Haus- und Industrietechnik AG scores 72.8 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.76.724%
  • 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.45.610%
  • 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.95.08%
Seiz Haus- und Industrietechnik AG scores 92.3 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.82.07%
Seiz Haus- und Industrietechnik AG scores 86.7 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).86.722%
Seiz Haus- und Industrietechnik AG scores 21.0 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 35.28.64%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.13.34%
Qualifications+0.00

Seiz Haus- und Industrietechnik 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 5 customer reviews. 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 5 reviews across all connected sources

Sources
GGoogle55
★TrustpilotSoon
PProvenExpertSoon

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

Press

Media

January 20, 2025Media
Lippuner übernimmt Seiz
leaderdigital.ch

Knowledge

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Location

Wilerstrasse 71
9230 Flawil
Opening hours
Mon
07:15 - 12:00, 13:15 - 17:15
Tue
07:15 - 12:00, 13:15 - 17:15
Wed
07:15 - 12:00, 13:15 - 17:15
Thu
07:15 - 12:00, 13:15 - 17:15
Fri
07:15 - 12:00, 13:15 - 16:45
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-106.833.743
Founded
1997 · 29 years
Last commercial register change
December 2, 2024
Employees
21 to 50
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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