How AI assistants choose who to recommend for water heater repair
We asked ChatGPT, Claude and Google AI Mode for water heater repair recommendations 262 times. Here is what they needed to see on a plumber's page before naming it to fix a water heater.
The short answer
Assistants mostly wanted to know what the first visit costs and what kind of heater the plumber fixes. They looked for the diagnostic fee and whether it counts toward the repair, the heater types handled, a written price before work, an honest repair-or-replace answer, and an arrival window.
- What people actually asked
- What your water heater repair page has to explain
- What the assistants looked for before recommending anyone
- Your water heater repair page checklist
- Questions owners ask
- How we got these numbers
- See it on your own website
What people actually asked
We asked for water heater repair in three different ways. Here is each one, word for word, with how many of the 262 answers it produced between September 3 and October 14, 2026:
- “Water heater repair near me — I'm in 33755. Who do you recommend?”96 answers
- “Who should I call for water heater repair in Seminole, FL?”86 answers
- “I need water heater repair within the next few hours — I'm in 34698. Who can actually come out?”80 answers, asked with five different timings: first thing tomorrow, within the next few hours, today, tomorrow morning and tonight
Together, the 262 answers covered eight towns in Pinellas County: Clearwater, Largo, Palm Harbor, Seminole, St. Petersburg, Tarpon Springs, Dunedin and Pinellas Park. Each town came up in 32 to 33 answers. By assistant: ChatGPT 128, Claude 86 and Google AI Mode 48.
Customers also call it “hot water heater repair” or “no hot water repair”, so use those words on the page as well.
The question underneath all of them
“Can this water-heater problem be assessed before I buy a replacement?” Diagnosis and repair should be distinguished from a replacement recommendation.
What your water heater repair page has to explain
Water heater repair often turns into a replacement conversation, and the answers knew it. Assistants told customers with an older heater to ask for both a repair price and a replacement price before deciding. Some plumbers listed only installs, which left assistants unsure they did repairs at all. A page that says the company diagnoses first, and explains when it recommends replacing instead, shows the customer they will get a fair answer.
The diagnostic fee came up more than anything else. Customers were told to ask for the service-call or trip fee before anyone is sent, and whether it is credited toward the repair. The page should state that fee and say what the visit includes, such as finding the cause and quoting the fix.
Heater type matters for who can fix it. Answers told customers to ask whether the plumber repairs gas, electric, tankless or hybrid heaters, and some asked about specific brands. A real repair example, describing the symptom, what the technician found and what was done, shows the customer the company handles their kind of problem.
What the assistants looked for before recommending anyone
We read all 262 answers to see what the assistants looked for before naming a company for water heater repair, what they told the customer to ask, and what they said they couldn’t find.
What the assistants told customers to ask
Most common first:
What is the diagnostic fee, and does it count toward the repair?
This was the question assistants raised most. They told customers to ask for the diagnostic or service-call fee up front, and whether it is credited toward the repair if they go ahead. Customers wanted to know what the visit alone would cost.
45% of the answers (119 of 262) brought this up.
Ask what the service call or diagnostic fee is, and whether it's credited toward the repair.
Does the plumber repair this type of heater?
Many answers told customers to confirm the plumber repairs their type of heater: gas, electric, tankless or hybrid. Some told tankless owners to ask for a technician trained on their brand. A company that lists only some types left customers unsure.
29% of the answers (77 of 262) brought this up.
Ask whoever you call whether they handle your heater type, tank or tankless, gas or electric, and whether they’ll quote the service call and likely repair range before dispatch.
Will the plumber give a written price before starting?
Answers regularly told customers to get a written estimate before any work starts. Some asked whether the quote covers the repair or only the visit. Customers wanted to approve the price once the cause was known.
27% of the answers (72 of 262) brought this up.
Ask for a diagnostic fee and a written estimate before any work starts.
Should the heater be repaired or replaced?
Assistants often told customers with an older heater, or a tank that is leaking itself, to ask for a repair-versus-replace comparison. They wanted an honest recommendation and both prices. Some noted that a replacement brings its own permit and code questions.
24% of the answers (63 of 262) brought this up.
Ask whether it's a repair or a replacement, and what the repair would cost compared with replacing the unit.
How soon can a technician arrive?
Customers with no hot water or a leak often needed help today or first thing tomorrow. Assistants could not see any schedule, so they told customers to ask for a firm arrival window rather than just same day.
13% of the answers (34 of 262) brought this up.
Ask for the first appointment tomorrow morning and a firm arrival window.
Is the repair covered by a warranty?
Some answers told customers to ask about a warranty on the repair, covering both parts and labor. They also asked whether the heater itself was still under the maker's warranty.
11% of the answers (29 of 262) brought this up.
Ask for the diagnostic fee, written repair-vs.-replacement recommendation, parts/labor warranty, and whether permits are included.
What the assistants couldn’t find
In 48 of the 262 answers, the assistant said it couldn’t find or confirm something it needed about a company. By assistant: Claude in 38 of its 86, ChatGPT in 10 of its 128 and Google AI Mode in 0 of its 48. As we asked it, Claude usually says what it couldn’t confirm; ChatGPT and Google AI Mode seldom do, so these counts mostly show what Claude couldn’t find. Most often:
- A phone number or other way to reach the company: 23 answers
- When the company could do the work: 20 answers
- Reviews it could check: 6 answers
- A price or how the job is priced: 5 answers
Assistants most often could not find a phone number or confirm anyone could come soon. Some could not tell whether a plumber repaired heaters or only installed them. A page that names repair, gives a number and states the diagnostic fee fills those gaps.
It lists water heater replacement and tankless installs, but I didn't see repair mentioned, so ask.
Where the assistants sent people
Each answer linked to the pages the assistant relied on. Of the 214 ChatGPT and Claude answers about water heater repair, this is how many linked at least once to each kind of site:
- A contractor’s own website: 95% (204 answers)
- A directory or review site such as Yelp, Angi or the BBB: 53% (114 answers)
- A manufacturer or home-improvement guide: 6% (12 answers)
- An official license lookup: 2% (4 answers)
- A Google search or Maps page: under 1% (1 answer)
A contractor’s own website was the page linked most often, so your site is usually what the customer is sent to read.
Google AI Mode works differently. In 94% of its 48 answers, the links opened Google’s own listing for a business rather than a website. There, your Google Business Profile is the page the customer sees, so it needs the same facts as your site.
The checks behind every recommendation, applied to water heater repair
Can the customer reach a person?
Phone numbers were what assistants most often could not find for this job. Some pointed customers to a directory profile to reach the plumber.
23 of the 262 answers about water heater repair, 23 of them from Claude, said the assistant couldn’t confirm this. In our July–August study across eight trades, it cost a business its place in 147 of the 290 conversations where it came up.
Can you schedule the job when the customer needs it?
Customers often asked who could come today, tonight or first thing tomorrow. Assistants could not confirm any schedule and noted that posted hours sometimes did not match emergency claims.
20 of the 262 answers about water heater repair, 15 of them from Claude, said the assistant couldn’t confirm this. In our July–August study across eight trades, it cost a business its place in 185 of the 657 conversations where it came up.
What do recent customers say?
Assistants often could not find independent reviews and relied on company claims. Reviews about installs did not show repair experience.
6 of the 262 answers about water heater repair, 6 of them from Claude, said the assistant couldn’t confirm this. In our July–August study across eight trades, it cost a business its place in 139 of the 569 conversations where it came up.
Source: How we research what AI assistants recommend.
Your water heater repair page checklist
Work through this list on your water heater repair page. Each item answers something the assistants looked for above.
- Use “water heater repair”, “hot water heater repair” or “no hot water repair” in the page title, the main heading and the first paragraph.
- State your diagnostic fee, what the visit includes, and whether the fee is applied to the repair.
- List the heater types and brands you repair, including tankless and hybrid models if you service them.
- Say that you quote the repair in writing after diagnosis and before any work begins.
- Explain how you decide between repair and replacement, and say that you quote both when the heater is near the end of its life.
- Say how quickly you usually reach a water heater call, your same-day cutoff, and whether evening visits cost more.
- Describe the warranty on your repairs, for parts and for labor, and say whether you handle manufacturer warranty claims.
- Put a working phone number at the top of the water heater repair page.
- State your hours for water heater calls and whether after-hours service is offered.
- Link to recent reviews and point to ones from customers whose heater you repaired.
Going further: let assistants see real openings
For planned work like water heater repair, a useful opening says whether it is for an assessment or the job itself, and whether the customer’s address is covered.
Merchant Context builds custom integrations with scheduling software so customers and AI assistants can read your current availability. Where your system records the job type, service area, duration and crew capacity, the integration can show those details with each opening, so an assistant can match it to the request instead of guessing.
We scope each connection to the software and data you actually have. A displayed opening is not a confirmed booking: the customer still confirms through your normal booking process, and the information is only useful while it is fresh.
Source: Merchant Context: custom integrations in the AEO service · checked 2026-10-14.
Questions owners ask
How much is a water heater diagnostic fee?
The answers did not find a standard fee. Assistants told customers to ask for the diagnostic or service-call fee before booking, and whether it is credited toward the repair. A page should state its own fee and what the visit includes.
When should a water heater be replaced instead of repaired?
Assistants told customers with an older heater, or a tank that is leaking itself, to ask for both a repair and a replacement price. They wanted an honest recommendation. A page should explain how the plumber makes that call.
Do plumbers repair tankless water heaters?
Some do, and answers told customers to ask whether a plumber repairs their type, including tankless and hybrid models. Some suggested asking for a technician trained on the brand. A page should list the types and brands it repairs.
Which AI assistants did you test?
ChatGPT, Claude and Google AI Mode. Between September 3 and October 14, 2026, they answered 262 questions about water heater repair: ChatGPT 128, Claude 86, Google AI Mode 48.
Will these changes guarantee a recommendation?
No. Nobody can promise that. These changes supply what the assistants were looking for in our research. Whether they move recommendations for your business is something to measure after they go live.
How we got these numbers
The questions, counts and quotes on this page come from the 262 answers ChatGPT, Claude and Google AI Mode gave between September 3 and October 14, 2026. We asked for water heater repair in eight towns in Pinellas County, Florida. We collected them with software rather than the consumer apps, which can answer differently. We counted what each answer mentioned, what it said it couldn’t find and where it linked. Quotes never name a business.
The study figures come from an earlier set of assistant conversations in July and August 2026 across eight trades, coded for the reason each business was included or left out. Counts overlap and are never added together.
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Source: Merchant Context: the current website offer · checked 2026-10-14.
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