12 AI Prompts for UK Plumbers (Copy & Paste 2026)

Most plumbers try AI exactly once. They open ChatGPT, type "write me a quote," get back something that reads like a boiler manufacturer's warranty disclaimer crossed with a mortgage offer, and decide the whole thing is a gimmick for marketing people. The tool was never the problem. The instruction was.

A prompt is just a brief handed to a very fast assistant who knows nothing about your business until you tell it. Give it a vague brief and you get vague work. Give it the customer, the tone, the job and the rules, and it writes the quote you would have written at the kitchen table — in four seconds instead of forty minutes. Below are twelve prompts built for a UK plumbing and heating business. Paste them in, swap the bits in square brackets for your own details, and skip the year of trial and error most people waste working out what to type.

Why Generic Prompts Do Not Work for Plumbers

"Write a quote" gives you generic rubbish because you handed over a generic instruction. The AI has no idea you charge £55 an hour, that you itemise boiler, flue, controls, flush, magnetic filter, Building Regs notification and Benchmark commissioning as separate lines, or that a combi-to-combi swap in a 1970s mid-terrace needs a powerflush and probably a new condensate run. It does not know your customers are mostly worried homeowners who want plain English, not manufacturer model numbers and F-codes. So it guesses, and its guesses read like everyone else's guesses.

The fix is dull and it works: tell it who the customer is, what tone you use, what the job involves, and what format you want back. A prompt that names the customer, the work, the price structure and three rules will beat a one-line request by a mile. Every prompt below is built that way. They look long because the detail is the whole point — the detail is what stops the output sounding like a robot wrote it.

One rule sits over all of them, and it never changes: AI writes and reads; you decide, diagnose and certify. Never ask these prompts to set a price, work out VAT, or — most importantly — generate a Gas Safe certificate, a CP12, a Benchmark commissioning form, or any gas safety documentation. Those are legal documents tied to your Gas Safe registration and to your liability under the Gas Safety (Installation and Use) Regulations 1998. Ask the AI to draft, summarise, reformat and chase. That is where it is brilliant, fast and safe.

These prompts work in the free version of ChatGPT, Claude or Google Gemini, so you can test every one of them this week without paying a penny. If you decide to upgrade, the paid tiers all sit in the same ballpark. ChatGPT Plus is £20 a month — VAT is added at checkout. Claude Pro is around £18 a month, or about £14 a month (£168 a year) if you pay for the year up front. Google's entry paid tier, AI Plus, is £4.50 a month. You do not need more than one to run everything below.

The Prompts

1. The itemised boiler install quote from survey notes

Write a clear, itemised quote for a domestic boiler installation from the
rough survey notes below. Tone: friendly and professional, plain English,
no jargon. Lay out every element as a separate line: boiler, flue kit,
controls/thermostat, magnetic filter, system powerflush, condensate run,
labour, Building Regulations notification, and Benchmark commissioning.
Leave any price I haven't given as a [SQUARE BRACKET] for me to fill in
— do NOT invent prices or VAT. End with how long the quote is valid, a
note that the install includes Gas Safe notification and Benchmark
registration, and how to accept.

My survey notes:
[combi-to-combi swap, Vaillant ecoTEC plus 832, three-bed semi in
Bristol, existing flue route reusable, horizontal flue through kitchen
wall, system needs a powerflush — sludge visible in radiator water,
MagnaClean Pro2 filter, new Hive thermostat, condensate to existing
kitchen waste pipe, one day on site, customer wants to understand
what's included]

When to use: every boiler quote you would otherwise scribble on the van dashboard or put off until 9pm. If you are still choosing which plumbing software to run these quotes through, start there.

Time saved: 30–40 minutes a quote, and you win more of them because a tidy, itemised quote beats a rushed one-liner every time.

2. The payment chaser — three escalating versions

A customer hasn't paid an invoice for plumbing/heating work. Draft THREE
reminder emails in my voice (polite but firm, never aggressive), each
under 120 words:
1. Gentle nudge — assumes they simply forgot, includes my payment link
2. Firmer — states the invoice is now [X] days overdue, mentions the
   work was completed and signed off on [date]
3. Final reminder before late-payment charges and pausing further
   work on any outstanding jobs
Don't threaten legal action or invent figures. Here are the details:
[invoice number, amount, date due, what the job was, payment link]

When to use: the reminder you can never find the right words for when you are annoyed — especially after a big boiler install where you have already paid the wholesaler.

Time saved: the 20 minutes of irritation every time — pick a version, drop in the numbers, send.

3. The booking confirmation and morning reminder

Write two short messages for a plumbing/heating customer in my voice
(warm, clear, professional):
1. A booking confirmation — date, rough arrival window, what I'll be
   doing, whether the water or heating will be off and for how long,
   and anything they need to do first (isolate the water supply if they
   know how, clear access to the boiler/cylinder cupboard, make sure
   I can reach the loft hatch if needed, keep pets out of the way).
2. A reminder to send the morning of the job.
Keep both under 80 words. Details:
[job type, date, time window, address, expected water/heating downtime,
any specific access or prep needed]

When to use: every booking — confirmations cut no-shows and "what time are you coming?" calls.

Time saved: a few minutes each, but it kills the phone tag that eats your day and means the customer is ready when you arrive.

4. Explaining the problem to a worried customer

Explain the following plumbing or heating issue to a non-technical
homeowner who is worried about it. Plain English, reassuring but honest,
no jargon, under 150 words. Cover: what is likely happening, whether it
is urgent or safe to leave for now, and what their options are. Don't
diagnose with certainty from limited info — say where I'd need to
inspect on-site. If it involves gas, emphasise that they should NOT
attempt any work themselves and should call a Gas Safe registered
engineer.

The issue:
[customer says the boiler is showing an F28 fault code, pressure gauge
reads 0.3 bar, and the heating won't fire up — house is cold, they're
worried about a gas leak]

When to use: the messages and calls where a customer wants to understand what is wrong before they will book — especially boiler faults and leaks where they are anxious.

Time saved: turns a ten-minute explanation you give weekly into a reusable, reassuring template.

5. The job-done social post

Write a short, friendly Facebook/Instagram post about a plumbing or
heating job I've just finished. No jargon, no hashtag overload (max 3),
sound like a real local plumber not a marketing agency. Under 80 words.
Mention the type of work and area without giving the customer's address.
Encourage local readers to get in touch. The job:
[full boiler install — Vaillant ecoTEC plus in a three-bed semi in
Southville, replaced a 15-year-old boiler that kept cutting out,
new MagnaClean filter and powerflush, customer said they can't believe
how quiet the new boiler is, 1 day on site]

When to use: after any job worth showing off — the marketing you know you should do and never do.

Time saved: ten seconds versus the twenty minutes of staring at a blank box, which usually ends in not posting at all.

6. A month of social posts from one list

Here are [5] jobs I've done recently. Write me [8] short social media
posts I can schedule over the next month — a mix of finished-job
showcases, a seasonal tip (e.g. bleed your radiators before winter, check
your boiler pressure, insulate exposed pipes before a frost), and a
gentle "now taking bookings" post. Friendly local-plumber tone, plain
English, each under 80 words, no more than 3 hashtags each. Vary the
openings so they don't all sound the same.

The jobs:
[list 5 recent jobs with a line each — e.g. boiler install, bathroom
refit, unvented cylinder, leak repair, landlord CP12 batch]

When to use: once a month, in fifteen minutes, to fill your whole social calendar.

Time saved: the single biggest marketing job of the month, done in one sitting.

7. The landlord CP12 chase and covering note

Draft a polite, professional email to a landlord or letting agent who
hasn't booked the annual gas safety check (CP12) on a rental property
I look after. Remind them it's a legal requirement under the Gas Safety
(Installation and Use) Regulations 1998, that the current certificate
expires on [date], and that failure to have a valid CP12 before the
expiry date is a criminal offence that can carry an unlimited fine. Offer
to book in before the deadline.

Then draft a SEPARATE short covering note I can send WITH the completed
CP12 once the inspection is done, in plain English for the landlord's
records, summarising that all gas appliances were checked and found
satisfactory (or listing any remedial work needed), and reminding them to
keep the certificate for two years and provide a copy to the tenant
within 28 days.

IMPORTANT: do not generate the CP12 itself or any Gas Safe documentation
— only the email and the covering note. Property and dates:
[address, certificate expiry date, number of gas appliances, tenant
access notes]

When to use: managing landlord work, where the chasing is half the job — most plumbers I know have dozens of CP12 renewals to track.

Time saved: keeps your landlord clients legal without you writing the same email twenty times a year, and the covering note turns a certificate into a professional package.

8. The boiler fault code translation for the customer

I've diagnosed a boiler fault and want to explain it to the customer in
plain English. Take the manufacturer fault code and my engineer's notes
below and write a short, calm explanation for a non-technical homeowner.
Cover: what the code means in plain English, whether it is safe or
whether they should avoid using the boiler until I return, what parts
or work are needed to fix it, and that I'll send a quote for the repair.
Reassuring but honest, under 200 words. Do NOT change my diagnosis or
invent faults — only translate what I've written into customer-friendly
language.

Boiler and fault:
[e.g. Worcester Bosch Greenstar 30i, EA fault code — ignition failure,
my notes: fan running but no spark at electrode, likely ignition lead
or electrode needs replacing, no gas smell, safe to leave off until
repair, part approx £[X] plus 1 hour labour]

When to use: after every diagnosis where the customer will ring you back asking "but what does that actually mean?" — which is most of them.

Time saved: turns the confused follow-up calls into a single clear note — and routinely turns the diagnosis into an accepted repair quote.

9. The plumbing wholesaler statement check

Here is a statement from my plumbing wholesaler. List clearly: 1) which
invoices on it I appear NOT to have paid, 2) the total outstanding, and
3) any duplicates or anything that looks wrong — wrong prices, double
charges on the same order, credits not applied. Lay it out as a simple
table. Do not change any figures — just read and organise what's here.

Wholesaler: [Plumbase / City Plumbing / Wolseley]
The statement:
[paste the statement text]

When to use: when a Plumbase, City Plumbing or Wolseley statement lands and you cannot face cross-checking it by hand.

Time saved: half an hour of squinting at a printout, and it catches the double-charges you would miss — plumbing wholesaler statements are notorious for credits that never appear.

10. The plain-English job sheet

Turn these job notes into a clean, professional work summary I can give
the customer for their records. Plain English so a homeowner understands
exactly what was done and why. Include: work carried out, any parts or
materials replaced (with make/model where relevant), whether the system
was tested and left working, and any recommendations for future
maintenance (e.g. annual boiler service, bleeding radiators, checking
expansion vessel pressure). Under 200 words. Notes:
[rough notes from the job — what you found, what you did, parts used,
e.g. "leak on 15mm compression fitting under kitchen sink, olive
corroded, cut back pipe and refitted with new olive and fitting,
tested no leaks, checked all visible joints under sink while there"]

When to use: after a repair, service or fault-find, when the customer wants something in writing for their records or their landlord.

Time saved: a professional record in two minutes that makes you look twice as organised as the next plumber — and gives the customer confidence you did a thorough job.

11. The Google review reply pack

Here are some recent Google reviews of my plumbing and heating business.
Draft a short, warm, personal reply to each — thank them, mention
something specific from their review (the job, what they liked, a detail
they mentioned), and sound like a real person not a template. For any
negative review, draft a calm, professional reply that takes the issue
seriously, apologises for their experience, and offers to put it right
offline. Keep each reply under 60 words. Reviews:
[paste reviews]

When to use: the reviews you mean to reply to and never do — replies that future customers read before they decide whether to call you or the next plumber in the list.

Time saved: clears a backlog of replies in one go and lifts how your business looks on Google — replied-to reviews rank higher.

12. The quote follow-up

I sent a customer a quote [X] days ago and haven't heard back. Write me
a short, no-pressure follow-up that checks whether they have any
questions about the quote, gently asks if they'd like to go ahead, and
mentions that I have availability in [week/timeframe] if they want to
book in. Under 90 words, friendly and professional — no desperation, no
hard sell. If the job was a boiler install, mention that prices on boilers
can change with wholesaler stock so the quote is valid for [X] days.
Context:
[the job, the quote amount, how long ago you sent it, any notes about
the customer's situation]

When to use: on every quote that goes quiet — the follow-up most plumbers never send, especially on big-ticket boiler jobs.

Time saved: minutes to write, and it recovers jobs you would otherwise have lost to silence. A polite follow-up on a £3,000 boiler install is worth the sixty seconds it takes.

How to Get the Most Out of These

Two habits double what you get back. First, the more you tell the AI about your business, the better it gets — paste in an old boiler quote you were happy with and say "match this style," and every quote after sounds like you, not a call centre. If you want to take it further, set up a Claude Project or Custom GPT with your prices, your tone and your hard rules baked in permanently, so you never have to re-explain your business. I wrote a full step-by-step guide to doing exactly that. On the accounting side, connecting Tradify to Xero removes the invoicing bottleneck these prompts cannot touch.

Second, treat the first answer as a draft from a keen apprentice: quick, useful, and always read before it leaves your hands. The AI will sometimes invent a price, a part number or a regulation with total confidence. You catch it because you know the job. It never signs anything off, it never issues a Gas Safe certificate, and it never commissions a boiler — you do.

Start with one. Pick the prompt for the task you dread most — for most plumbers that is quoting boiler installs — and use it on your very next job this week. Once it has saved you an evening, the rest will follow.

Related guides: If you found this useful, see our guide on The Plumbing Business That Runs Itself: How UK Plumbers Automate Quoting, Scheduling and Invoicing in 2026 and How UK Plumbers Are Using AI to Cut Admin Time (Without Sounding Like a Robot).

Which of these twelve are you going to try first — and what is the one plumbing task you would most want a prompt for that is not on the list? Reply and tell me; I am building the next batch from real requests.

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