Plumbers in Zurich that AI assistants recommend
We asked ChatGPT and Claude the four questions a buyer asks when looking for plumbers in Zurich, three times each, in German, and counted who they named. These are the businesses named in two or more of the 24 answers.
Names are printed as the assistants wrote them. We have not checked that any of them is good, open, or real.
- Answers
- 24
- Businesses named
- 47
- Named only once
- 37
- Named by 2+ assistants
- 7 of 10
- Named again on a rerun
- 12%
Edition September 2026. Download the data
Asked for plumbers in Zurich, ChatGPT and Claude most often named Schibli AG (38% of answers), Hälg & Co. AG Zürich (25%) and Koster AG Gebäudetechnik (17%). Across 24 answers they named 47 different businesses, 37 of them only once. Each of four buyer questions was asked three times, in German, in September 2026.
The ranking
Share is the fraction of the 24 answers that named a business. The range under it is a 95% confidence interval: where two ranges overlap, the gap between those businesses could be chance.
| # | Business | Share | ChatGPT | Claude | Questions | Avg. position |
|---|---|---|---|---|---|---|
| 1 | Schibli AG | 95%: 21 to 57% | 42% | 33% | 3 of 4 | 2.6 |
| 2 | Hälg & Co. AG Zürich | 95%: 12 to 45% | 33% | 17% | 3 of 4 | 2.5 |
| 3 | Koster AG Gebäudetechnik | 95%: 7 to 36% | 17% | 17% | 2 of 4 | 1 |
| 4 | RohrMax AGAlso written Rohrmax AG | 95%: 4 to 31% | 8% | 17% | 1 of 4 | 1 |
| 5 | Neukom Installationen AG | 95%: 4 to 31% | 8% | 17% | 2 of 4 | 1.7 |
| 6 | Hälg & Co. AG | 95%: 4 to 31% | 17% | 8% | 2 of 4 | 2.7 |
| 7 | Hächler AG Zürich | 95%: 2 to 26% | 8% | 8% | 2 of 4 | 1 |
| 8 | Kälin Haustechnik AG | 95%: 2 to 26% | 0% | 17% | 1 of 4 | 1 |
| 9 | Sanitas Troesch AG | 95%: 2 to 26% | 0% | 17% | 2 of 4 | 2 |
| 10 | Koster AG Gebäudetechnik Zürich | 95%: 2 to 26% | 17% | 0% | 2 of 4 | 2.5 |
Each assistant column is the share of that assistant's own answers. Questions counts how many of the four produced the name at least once; position is where it came in the answer's list, 1 being first. 37 more names came up in a single answer and are counted above but not listed.
What each assistant said
The same questions, the same number of times, and often different names. Each column is one assistant's top five from the ranking above, with the share of its own answers that named them.
| # | ChatGPT | Claude |
|---|---|---|
| 1 | Schibli AG42% | Schibli AG33% |
| 2 | Hälg & Co. AG Zürich33% | Hälg & Co. AG Zürich17% |
| 3 | Koster AG Gebäudetechnik17% | Koster AG Gebäudetechnik17% |
| 4 | Hälg & Co. AG17% | RohrMax AG17% |
| 5 | Koster AG Gebäudetechnik Zürich17% | Neukom Installationen AG17% |
Named here? Put it on your site
Every business in the ranking was named in two or more answers. The badge says that and nothing more: no position, because the ranges above do not support one. It links back to this page, so anyone can check.
<a href="https://aigrow.gg/index/plumbers/zurich"><img src="https://aigrow.gg/badges/index/2026-09/plumbers/zurich.svg" width="312" height="100" alt="Named by AI assistants: Plumbers in Zurich, AIGROW AI Visibility Index, September 2026"></a>The questions
Asked word for word, three times each, to every assistant through its API, in German. The English under each is our translation. The prompt is the one the free scan uses. No web search, no location and no chat history, so every answer starts from the same place.
- 1Wer ist der beste Sanitärinstallateur in Zürich?Who is the best plumber in Zurich?
- 2Bei mir zu Hause in Zürich leckt ein Rohr. Welchen Sanitärbetrieb soll ich anrufen?I have a leaking pipe at home in Zurich. Which plumbing company should I call?
- 3Ich brauche heute Abend einen Sanitär-Notdienst in Zürich. Wen empfiehlst du?I need an emergency plumber in Zurich tonight. Who would you recommend?
- 4Welchem Sanitärinstallateur in Zürich würdest du den Austausch eines Boilers anvertrauen?Which plumber in Zurich would you trust to replace a water heater?
How to read this page
- What it measures
- Which names these models produce when asked cold, from what they learned in training. It is not a review, a rating or our recommendation, and a business missing here may simply be one the models were never shown.
- Why the ranges matter
- 24 answers is a sample. Asked again next month, most shares will move by a few points; the ranges say how far they could move by chance alone.
- One business, several spellings
- Branches, legal suffixes and spellings of one business are merged, and the other spellings are printed under its name. Names that might be two businesses are kept apart.
- A name is wrong
- If a business here is closed, misnamed or yours and you want it removed, tell us. We correct or remove it when the page is next published.
Is your business on this list?
The free scan asks the same assistants the questions your customers ask, scores whether they name you, and lists who they name instead.
Edition September 2026 · data under CC BY 4.0