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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryBusiness & Technical ServicesTechnical Consulting & EngineeringOeschgenZ-AG Engineering
Z-AG Engineering Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of ZAG Engineering is the planning, construction, maintenance and servicing of steam systems, including the rental and sale of steam generators and fittings.

AI-generated
Offering

Products & services

Industry:Technical Consulting & Engineering
✓ Offered7
Engineering & Planning
Planning and project engineering of heat and energy supply systems, complete boiler houses, heat recovery systems, studies, tenders, CAD drawings and 3-D planning.
Steam Boiler Service
Steam boiler inspections, steam boiler maintenance and repairs, maintenance from half-yearly up to yearly, safety and functional checks, SVTI support and commissioning of steam installations.
Steam Generators and Steam Boilers
JUMAG DG and FLO series, JUMAG EDI series, Babcock Wanson boilers with large water space and furnace space, and Zander & Ingeström electric steam boilers.
Steam Plant Rental
Mobile steam generators and steam plants from small electric steam generators to large steam systems and container steam units for temporary steam supply.
Pipework Construction
Pipework construction in stainless steel and steel for steam installations, including project management, coordination, prefabrication and solutions for district heating systems.
Steam Trap Testing
Inspection of steam traps with inspection report, measurement with a calibrated TrapMan device, identification of connected loads, and recommendation plus replacement of faulty traps.
TLV Valves
Mechanical, thermostatic and thermodynamic steam traps, drainage stations, pressure reducing valves, control valves, flow meters, cyclone separators and TLV accessories.
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4.2/5

Z-AG Engineering

Trust & reputation

ranQ Trust Score of Z-AG Engineering: 4.2 out of 5.0

Trust Score4.2/ 5.0

Very high

x

Data basis 96% · As of October 2026

Z-AG Engineering scores 65.9 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.75.024%
  • 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.40.910%
  • 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%
Z-AG Engineering scores 89.3 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.70.07%
Z-AG Engineering scores 85.0 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).85.022%
Z-AG Engineering scores 77.1 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 35.77.14%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Z-AG Engineering 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 4 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 4 reviews across all connected sources

Sources
GGoogle54
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Comparisons

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Location

Birkenweg 453
5072 Oeschgen
Opening hours
Mon
07:00 - 17:00
Tue
07:00 - 17:00
Wed
07:00 - 17:00
Thu
07:00 - 17:00
Fri
07:00 - 16:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-108.465.550
Founded
1996 · 30 years
Last commercial register change
August 23, 2024
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.
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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