Retention & Reminders for Plumbers
The cylinder you fitted needs servicing annually and nobody told the customer
The recurring product hiding in your installed base
A bathroom refit is £1,850. A boiler replacement, £1,670. A shower installation, £840. A leak repair, £235. A blocked drain, £215.
Plumbing looks like a trade with no recurrence. Things break, you fix them, the customer disappears until the next thing breaks. That is broadly how the trade behaves and it is why most plumbers rebuild their customer base from scratch every year.
But there is a genuine annual product sitting inside a good number of the houses you have already worked in, and almost nobody sells it.
Unvented hot water cylinders require periodic maintenance — commonly annually — to keep the safety components working and, in most cases, to keep the manufacturer’s warranty valid. The expansion vessel, the pressure relief and temperature relief valves and the tundish all need checking, and a system that has never been looked at is a system where those components have quietly aged.
Almost no homeowner knows this. They were told at installation, possibly, five years ago, by somebody who then never mentioned it again.
That is a recurring, legitimate, warranty-backed annual visit to every unvented system you have ever installed or attended, and it is the closest thing to a service book that plumbing offers.
What else can genuinely be put on a clock
Bathroom aftercare. Silicone fails, grout deteriorates, seals go. A twelve-month check after a £1,850 refit is welcomed, catches small problems while they are small, and is the natural moment to discuss the next room.
Water softeners and filtration, which have consumable and service intervals built in.
Pumps, macerators and sump systems, all of which have maintenance positions and all of which fail expensively when ignored.
Drainage on older properties, where a household with recurring blockages benefits from a planned annual clear rather than an emergency every eighteen months.
Landlord and agent work, where a plumber who holds the maintenance across a portfolio has recurring reactive income rather than one-off callouts.
None of that is invented demand. All of it is work that genuinely should happen and currently does not, because nobody set a date.
The ratio
A boiler is £1,670. Our Seen package is £29 a month — £348 a year. One boiler replacement covers nearly five years.
On cylinders: a plumber with eighty unvented systems in their history, converting even a third onto an annual service, is a recurring visit base that did not exist before — plus the parts, the faults found early, and the replacement work that comes from being the person who is there every year.
What we’d actually set up
An installed-base audit. Every unvented cylinder, softener, pump and macerator you have fitted or attended, with dates. Most plumbers have never looked at their history this way.
An annual service offer for unvented systems, with the warranty position explained plainly, prompted automatically off the install or last-service date.
A twelve-month bathroom check running off completion dates.
A planned drainage arrangement for the properties that call every winter.
A landlord maintenance position, because agents prefer one contractor holding the whole property to three specialists.
Rebooking measured, so the recurring base is a number you watch rather than a hope.
What good looks like at twelve months
- Every unvented system in your history on a schedule
- Annual service prompts going out without anybody remembering
- Bathroom check-ins catching silicone and seal problems before they become leaks
- Recurring winter drainage work booked in advance rather than attended in crisis
- A visible base of repeat customers where there was previously none
The mistakes we see most
Mentioning the service requirement once, at installation. It is forgotten within a month.
Treating every job as a one-off. It is the default in the trade and it is why the customer list never compounds.
No record of what was installed. Without it there is no base to work from.
Waiting to be called. Recurring work in this trade exists only if somebody schedules it.
The first ninety days
Weeks 1–4. The installed-base audit — cylinders first, since they carry the clearest annual case.
Weeks 5–8. The unvented service offer written and the first prompts out, with the warranty position explained.
Weeks 9–12. Bathroom check-ins and drainage arrangements set live, plus rebooking reporting.
At ninety days the measure is how many properties are on a schedule. In most plumbing businesses that number starts at zero, which is precisely why the gain is available.
Where this lands in Gaffer
Installs record the appliance, the system type and the date, so an unvented cylinder fitted four years ago is a scheduled service rather than a memory.
Because completed visits schedule the next one, the annual rhythm maintains itself once it exists rather than depending on anybody keeping a list.
And with job history on the customer record, a bathroom check-in twelve months on opens with what was actually installed rather than with a guess.
Turning an emergency customer into a scheduled one
The installed base above is one route. The larger population is everybody you have attended once in a crisis, and the question is what any of them could reasonably be put on a schedule for.
The honest answer for most is nothing — you fixed a tap and there is no annual tap service. But a proportion of those visits revealed something with a genuine interval attached, and it went unrecorded because you were there for something else.
An old boiler seen while fixing a leak. A hot water cylinder with no service history. A soil stack with a history of blockages. A stopcock that would not turn, which is worth replacing before it matters. A property with recurring winter freezing on an exposed run.
Every one of those is a note that could have been made and a date that could have been set, and in most plumbing businesses the visit is invoiced and forgotten.
So the change is at the job rather than in the marketing. A short standard note on every attendance — what else did you see, what is ageing, what would you flag — turns a stream of one-off emergencies into a base with dates attached to it.
Do that for a year and the following year has structure in it that this year did not. It is the single highest-leverage habit in this trade and it costs about ninety seconds a job.
Questions plumbers ask
Do unvented cylinders genuinely need annual attention? Periodic maintenance is the standard manufacturer position and is commonly required to keep warranties valid. Check the specific manufacturer terms and say exactly that.
Will customers pay for it? A proportion will, particularly once the warranty position is explained. Those who decline have still heard from you.
What if I did not install it? Servicing a system somebody else fitted is normal work, and it frequently produces the customer permanently.
Is this worth it against emergency work? Emergency work pays today and produces nothing. This produces a base, which is what makes a business worth something.
Get your free retention review · Bigger outfit? Talk to us
See what we'd do for plumbers
Put your website in and we'll tell you what's losing you work — speed, mobile, your Google profile, reviews and the pages you're missing. Two minutes, no call unless you want one.