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AI Visibility Index · September 2026

Plumbers in Cologne that AI assistants recommend

We asked ChatGPT, Claude and Gemini the four questions a buyer asks when looking for plumbers in Cologne, three times each, in German, and counted who they named. These are the businesses named in two or more of the 36 answers.

Check whether AI names youSee the ranking

Names are printed as the assistants wrote them. We have not checked that any of them is good, open, or real.

Plumbers · Cologne
14%of answers named Schmitz & Söhne GmbH
Answers
36
Businesses named
76
Named only once
52
Named by 2+ assistants
6 of 24
Named again on a rerun
13%

Edition September 2026. Download the data

Asked for plumbers in Cologne, ChatGPT, Claude and Gemini most often named Schmitz & Söhne GmbH (14% of answers), Schmitz Haustechnik (11%) and Hans Klein (11%). Across 36 answers they named 76 different businesses, 52 of them only once. Each of four buyer questions was asked three times, in German, in September 2026.

The ranking

The AI Recommendation Rate is the fraction of the 36 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.

Plumbers in Cologne named by AI assistants, September 2026
#BusinessAI Recommendation RateChatGPTClaudeGeminiQuestionsAvg. position
1Schmitz & Söhne GmbHIs this your business?14%95%: 6 to 29%0%0%42%4 of 42.4
2Schmitz HaustechnikAlso written Schmitz Haustechnik GmbH, Schmitz Haustechnik GmbH KölnIs this your business?11%95%: 4 to 25%0%8%25%3 of 41.3
3Hans KleinAlso written Hans Klein Heizung Sanitär GmbH, Hans Klein Heizungs- und Sanitärtechnik GmbHIs this your business?11%95%: 4 to 25%8%25%0%2 of 42.3
4H. SchmitzAlso written H. Schmitz GmbH – Sanitär und Heizung, Köln, H. Schmitz GmbH Sanitär Heizung Klima, H. Schmitz GmbH Sanitär-Heizung-KlimaIs this your business?8%95%: 3 to 22%17%8%0%2 of 41.7
5Peter SchüttlerAlso written Peter Schüttler GmbH, Peter Schüttler GmbH & Co. KG, Peter Schüttler Sanitär- und HeizungstechnikIs this your business?8%95%: 3 to 22%0%0%25%2 of 42
6Barth & Co.Also written Barth & Co. GmbH, Barth & Co. Sanitär- und Heizungstechnik, Barth & Co. Sanitärtechnik GmbHIs this your business?8%95%: 3 to 22%0%0%25%2 of 43.3
7BöhmAlso written Böhm Haustechnik GmbH, Böhm Sanitär- und Heizungstechnik, Böhm Sanitär- und Heizungstechnik GmbHIs this your business?8%95%: 3 to 22%0%0%25%3 of 43.3
8Sanitär-Notdienst KölnAlso written Sanitär Notdienst KölnIs this your business?8%95%: 3 to 22%0%0%25%2 of 43.3
9Kölner Rohrreinigung & Sanitär NotdienstIs this your business?6%95%: 2 to 18%0%0%17%1 of 41
10Peter Schütt Sanitär- und Heizungstechnik GmbHIs this your business?6%95%: 2 to 18%0%0%17%2 of 41
11H. J. SchmitzAlso written H. J. Schmitz GmbH, H. J. Schmitz GmbH & Co. KGIs this your business?6%95%: 2 to 18%0%17%0%1 of 41.5
12RheinEnergieAlso written RheinEnergie AG – Entstördienst Wasser, Stadtwerke Köln – RheinEnergie AGIs this your business?6%95%: 2 to 18%8%8%0%1 of 41.5
13ELMARAlso written ELMAR Installationen GmbH, Köln, ELMAR Sanitär- und Heizungstechnik GmbHIs this your business?6%95%: 2 to 18%8%8%0%2 of 42
14Köln-Düsseldorfer NotdienstAlso written Köln-Düsseldorfer Notdienst 24, Köln-Düsseldorfer Notdienst GmbHIs this your business?6%95%: 2 to 18%0%17%0%1 of 42
15KölnBäderAlso written KölnBäder GmbH, KölnBäder Technik / Gebäudewirtschaft KölnIs this your business?6%95%: 2 to 18%0%17%0%2 of 42
16Peter Schiffer Sanitär- und HeizungstechnikIs this your business?6%95%: 2 to 18%0%0%17%1 of 42
17Peter Schorn Sanitär- und HeizungstechnikAlso written Peter Schorn Sanitär- und Heizungstechnik GmbHIs this your business?6%95%: 2 to 18%0%0%17%1 of 42
18Peter VossenAlso written Peter Vossen GmbH, Peter Vossen Sanitär-Heizung-Klima GmbH & Co. KGIs this your business?6%95%: 2 to 18%8%8%0%1 of 42
19S. LückerathAlso written Bäder & Heizung S. Lückerath GmbH, Lückerath Sanitär & Heizung GmbHIs this your business?6%95%: 2 to 18%17%0%0%2 of 42
20H. & J. Kuhlmann GmbHIs this your business?6%95%: 2 to 18%0%0%17%2 of 42.5
21H.W. Kuhlmann GmbHIs this your business?6%95%: 2 to 18%0%0%17%2 of 42.5
22HolzmannAlso written Holzmann GmbH Sanitär Heizung Klima, Holzmann Sanitär & Heizung GmbHIs this your business?6%95%: 2 to 18%17%0%0%1 of 43
23Böhm & Sohn GmbHIs this your business?6%95%: 2 to 18%0%0%17%2 of 43.5
24Klaus MüllerAlso written Klaus Müller Sanitär GmbH, Klaus Müller SanitärtechnikIs this your business?6%95%: 2 to 18%0%0%17%1 of 44.5

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. 52 more names came up in a single answer and are counted above but not listed.

Is this your business?

See what the assistants say about your business today. The free checker asks ChatGPT, Claude, Gemini and Grok two of the Index questions for this category, with the category and the place already filled in, and shows every answer word for word. About 30 seconds, no sign-up.

Check your businessNamed above? Add the badgeWhat the audit does

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.

#ChatGPTClaudeGemini
1H. Schmitz17%Hans Klein25%Schmitz & Söhne GmbH42%
2S. Lückerath17%H. J. Schmitz17%Schmitz Haustechnik25%
3Holzmann17%Köln-Düsseldorfer Notdienst17%Peter Schüttler25%
4Hans Klein8%KölnBäder17%Barth & Co.25%
5RheinEnergie8%Schmitz Haustechnik8%Böhm25%

ChatGPT named no business in 3 of its 12 answers.

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.

Correct or remove a listing
Named by AI assistants: Plumbers in Cologne, AIGROW AI Visibility Index, September 2026
<a href="https://aigrow.gg/index/plumbers/cologne"><img src="https://aigrow.gg/badges/index/2026-09/plumbers/cologne.svg" width="312" height="100" alt="Named by AI assistants: Plumbers in Cologne, AIGROW AI Visibility Index, September 2026"></a>

The questions

Asked word for word, three times each, to every assistant, 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.

  1. 1Wer ist der beste Klempner in Köln?Who is the best plumber in Cologne?
  2. 2Bei mir zu Hause in Köln leckt ein Rohr. Welchen Sanitärbetrieb soll ich anrufen?I have a leaking pipe at home in Cologne. Which plumbing company should I call?
  3. 3Ich brauche heute Abend einen Notdienst-Installateur in Köln. Wen empfiehlst du?I need an emergency plumber in Cologne tonight. Who would you recommend?
  4. 4Welchem Installateur in Köln würdest du den Austausch eines Warmwasserspeichers anvertrauen?Which plumber in Cologne would you trust to replace a water heater?

How to read this page

The full method
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
36 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.

Where the assistants look

The sites read most often, with web search on, before the assistants answer about this category in Germany. From the AI Source Map: 8 answers.

See every site for this category
trustlocal.de
Read in 88% of the answers
reddit.com
Read in 88% of the answers
werkenntdenbesten.de
Read in 75% of the answers

Elsewhere in the Index

Plumbers elsewhere
BerlinDüsseldorfFrankfurtHamburgMunichStuttgart
Also in Cologne
DentistsLawyersAccountantsGymsReal estate agenciesRestaurants

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.

Run the free AI scanRead the method

Edition September 2026 · published by Guglielmo Paesano, founder of AIGROW · data under CC BY 4.0