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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryCrafts & TradesPlumbing & Building ServicesMelsJohn Heizung + Sanitär AG
John Heizung + Sanitär AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of John Heizung + Sanitär AG consists of planning, coordinating, installing and repairing heating and sanitary systems, as well as planning and installing solar systems. This includes in particular: planning and installation of heating systems such as heat pumps, gas and oil heating systems; planning and coordination of complete sanitary systems for new and existing buildings, as well as renovations; design of bathrooms according to customer needs; installation and repair of sanitary systems; and planning and installation of solar systems for environmentally friendly energy generation.

AI-generated
Offering

Products & services

Industry:Plumbing & Building ServicesSolar & Photovoltaics
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John Heizung + Sanitär AG

✓ Offered4
Heating system works
Replacement of heating systems with oil, gas or a heat pump; new builds, domestic water heaters, flushing of underfloor heating, boiler descaling, pipe insulation as well as heat distribution, controls and radiators.
Plumbing works
New builds, conversions and renovations of washrooms, bathrooms and kitchens; installation and replacement of boilers, descaling, descaling systems, water filters, sanitary fixtures and fittings as well as pipes and repairs.
Bathroom remodeling and bathroom refurbishment
Planning and implementation of bathroom design, bathroom remodeling and complete refurbishments, including coordination from A to Z according to wishes and needs.
Service and repair works
Quick repairs, descaling and service work in the event of water damage, heating system failure, pipe bursts and blocked drain lines.
Trust & reputation

ranQ Trust Score of John Heizung + Sanitär AG: 4.2 out of 5.0

Trust Score4.2/ 5.0

Very high

x

Data basis 96% · As of October 2026

John Heizung + Sanitär AG scores 73.7 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.77.524%
  • 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.61.010%
  • 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%
John Heizung + Sanitär AG scores 85.5 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%
John Heizung + Sanitär AG 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%
John Heizung + Sanitär AG scores 10.0 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 35.10.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

John Heizung + Sanitär AG reaches a ranQ Trust Score of 4.2 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.8 out of 5 stars from 10 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
4.8
of 5

Aggregated from 10 reviews across all connected sources

Sources
GGoogle4.810
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Bahnhofstrasse 43
8887 Mels
Opening hours
Mon
08:00 - 12:00, 13:00 - 16:45
Tue
08:00 - 12:00, 13:00 - 16:45
Wed
08:00 - 12:00, 13:00 - 16:45
Thu
08:00 - 12:00, 13:00 - 16:45
Fri
08:00 - 12:00, 13:00 - 16:45
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-113.585.823
Founded
2007 · 19 years
Last commercial register change
March 4, 2020
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.
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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