Here is a question worth sitting with for a moment. What if a chunk of your income arrived every single month, whether the phone rang or not?
For most plumbing and heating businesses, income is reactive. A boiler breaks, you get a call, you fix it, you invoice. When the calls dry up in summer, so does the cash. You end up riding a financial rollercoaster that makes it nearly impossible to plan ahead, hire confidently, or sleep properly.
Boiler service plans change that equation entirely. They turn one-off customers into long-term clients, smooth out your cash flow, and give you a foundation of predictable revenue that your business can actually grow on.
Let’s explore how to set one up properly, price it so it actually makes you money, and keep the books clean so you know exactly where you stand.
Why Recurring Revenue Changes Everything for a Heating Business
Consider this. Two heating engineers both turn over £80,000 a year. One earns it entirely from reactive work. The other has £30,000 of that locked in through monthly service plans, with the rest coming from callouts and installations.
On paper, they look the same. In reality, they are running completely different businesses.
The engineer with recurring revenue knows that £2,500 is landing in the bank every month before a single emergency call comes in. That changes everything. It means:
- Predictable income you can plan around, not hope for
- Reduced seasonality because direct debits keep collecting in July and August when breakdown calls disappear
- Stronger customer retention because a customer paying you monthly is far less likely to call someone else when they need a new boiler
- A more valuable business if you ever want to sell, because recurring revenue is exactly what buyers look for
In my eyes, the service plan model is one of the smartest moves a heating business can make. It is not complicated. But it does need to be set up properly from day one.
What a Boiler Service Plan Typically Includes
You do not need to reinvent the wheel here. Most successful boiler service plans cover a combination of the following:
- Annual boiler service (the core offering that keeps everything compliant and safe)
- Priority callouts for plan members, so they jump the queue when something goes wrong
- Parts and labour cover for breakdowns, up to a set limit
- Discounts on new installations, giving customers a reason to come to you first when the boiler needs replacing
- No excess or call-out charges on covered repairs
The key point is this: you are not just selling an annual service. You are selling peace of mind, priority access, and a relationship. That is worth more than a one-off £70 service call, and your pricing should reflect it.
How to Structure Tiered Pricing That Works
The businesses doing this well almost always offer tiered plans. Think of it like Good, Better, Best. Three options that let the customer choose their level of cover, and that naturally push most people towards the middle tier.
Here is a simple structure that works:
Tier 1 — Basic Service (Good)
Price: £8-10 per month
- Annual boiler service included
- Reminder and booking handled for the customer
- 10% discount on any repair work needed
Tier 2 — Service + Cover (Better)
Price: £12-15 per month
- Everything in Basic
- Parts and labour cover for boiler breakdowns (up to a set annual limit, e.g. £250-£500)
- Priority response within 24-48 hours
- No call-out fee for covered repairs
Tier 3 — Premium (Best)
Price: £20-25 per month
- Everything in Service + Cover
- Full parts and labour cover (higher annual limit or uncapped for boiler-related faults)
- Same-day priority response
- Annual system health check beyond just the boiler
- 15% discount on new boiler installations
Most customers will land on the middle tier. That is by design. The basic tier feels too bare, the premium tier feels like a stretch, and the middle one feels just right. If you have read anything about pricing psychology for trades businesses, you will recognise this pattern immediately.
The Numbers: What Recurring Revenue Actually Looks Like
Let’s stop talking in theory and run some real figures.
Say you sign up 200 customers on your middle tier at £12 per month. That gives you:
200 x £12 = £2,400 per month
£2,400 x 12 = £28,800 per year
Now push that to £15 per month:
200 x £15 = £3,000 per month
£3,000 x 12 = £36,000 per year
That is £28,800 to £36,000 of predictable annual income before you have picked up a single reactive call, before you have quoted a single installation, and before you have chased a single invoice. It arrives by direct debit every month like clockwork.
Now think about what that means for your business. You could comfortably cover a van payment, an employee’s wages, or your fixed overheads entirely from service plan income. Everything else becomes profit on top.
Want to grow to 500 customers? At £15 per month, that is £90,000 per year of recurring revenue. That is a serious business.
Of course, you need to account for the cost of delivering those services. Each annual service costs you time and possibly parts. Some customers will make claims against their cover. But if you price it right and track your costs properly, the margins are strong. Which brings us to the financial setup.
The Financial Setup You Need to Get Right
Direct Debit Collection
Chasing monthly payments manually is a disaster waiting to happen. You need a proper direct debit provider. GoCardless is the most popular choice for small businesses. It automates collection, handles failed payments, and integrates with most accounting software.
Expect to pay a small transaction fee per collection (typically 1-2% or a fixed pence-per-transaction fee), but that is a small price for never having to chase a monthly payment again.
Separate Tracking
Your service plan income should be clearly separated from your reactive and installation income. You need to see at a glance:
- How much recurring revenue you are generating each month
- How much it costs you to deliver the services promised
- What your actual profit margin is on plans versus other work
If it is all lumped together in one big sales figure, you are flying blind. Most cloud accounting packages let you set up tracking categories or separate income accounts for this. Use them.
VAT on Monthly Plans
If you are VAT registered, your monthly plan payments are subject to VAT. That means a £15 per month plan is really £12.50 plus £2.50 VAT. You need to account for this properly from the start, issue VAT invoices or receipts for each payment, and make sure your pricing still works after VAT is stripped out.
This catches people out more often than you would think. A plan that looks profitable at £15 per month can feel a lot tighter at £12.50 once VAT is removed and you factor in delivery costs. Build your pricing with VAT in mind from day one. If you need a refresher on how VAT works for heating businesses, that is worth reading alongside this.
How to Account for Service Plan Income Properly
This is where a lot of heating businesses get into a mess, and it is worth understanding even if your accountant handles the detail.
The question is simple: when you collect £15 per month from a customer, when do you actually “earn” that income?
There are two approaches:
Option 1 — Recognise Income As You Collect It
You treat each monthly payment as income in the month you receive it. This is the simpler approach and works fine for most small heating businesses, especially sole traders and small limited companies.
Option 2 — Spread Income Over the Service Period
If a customer pays £180 per year (£15 x 12), but you deliver the main service in October, you could argue the income should be spread across the year. This is more technically correct from an accounting perspective and matters more as your plan base grows.
For most businesses starting out, option one is perfectly fine. But as your service plan book grows into the hundreds of customers, spreading the income gives you a much more accurate picture of your profitability month to month. Your accountant should be advising you on which approach suits your situation.
The important thing is that whichever method you use, you also need to track the cost of delivering those plans. If you recognise £36,000 in service plan income but have no idea what it cost you in engineer time, parts, and travel to deliver those 200 services and handle the breakdown claims, you do not actually know whether the plans are profitable. And that defeats the entire purpose.
Software and Systems to Manage It All
Running service plans on spreadsheets and memory works for maybe 20 customers. Beyond that, you need proper systems.
Job Management Platforms
Platforms like Commusoft, ServiceM8, or Joblogic let you schedule annual services, track customer plans, manage reminders, and log all work against each customer. Some have built-in service plan management features. If you are already using one, check whether it handles recurring plans before adding another tool.
Direct Debit Providers
GoCardless remains the go-to for most small businesses. It integrates directly with Xero, QuickBooks, and FreeAgent, so payments can be automatically reconciled against the right customer and the right income category.
Accounting Software
Your cloud accounting software should be set up with a dedicated income account or tracking category for service plan revenue. This keeps it separate from your other income streams and makes it easy to pull reports showing exactly how your plans are performing.
Getting this cash flow tracking right from the start saves you a world of pain later. Retrofitting proper tracking onto 300 active plans is not a job anyone enjoys.
How Your Accountant Should Be Helping
If your accountant just files your tax return once a year and sends you the bill, they are not helping you build a better business. When it comes to service plans, your accountant should be actively involved in:
- Pricing the plans properly so they are profitable after VAT, delivery costs, and the occasional claim
- Setting up your accounts to track service plan income and costs separately
- Reviewing plan profitability at least quarterly so you know which tiers are making money and which need adjusting
- Advising on income recognition so your accounts reflect reality, not just cash in the bank
- Flagging when your plan book is big enough to affect your VAT position or tax planning
This is not extra work for the sake of it. If you are building a recurring revenue stream worth £30,000 or more per year, you need someone keeping an eye on the numbers with you. Not just once a year at tax time, but regularly, as the plans grow.
Getting Started: A Practical First Step
You do not need to launch with three perfect tiers, a custom app, and 500 customers on day one. Start simple.
- Design two or three tiers using the structure above. Price them so the middle tier is your target.
- Set up GoCardless (or a similar provider) and connect it to your accounting software.
- Create a separate income category in your accounts for service plan revenue.
- Offer the plan to every customer you service this year. A simple conversation at the end of a job is all it takes.
- Track your costs from the start. Log the time and parts spent on every plan-related job.
If you sign up just five customers a month, you will have 60 customers within a year. At £15 per month, that is £10,800 in annual recurring revenue. Not life-changing on its own, but it is a foundation. And it grows every single month.
The Bottom Line
Boiler service plans are not just a nice add-on. They are a genuine shift in how your business earns money. Instead of starting every month from zero, hoping the phone rings, you start with a base of guaranteed income that covers your fixed costs and gives you room to breathe.
The businesses that get this right build something worth more than the sum of its jobs. They build something predictable, scalable, and ultimately more valuable.
But it only works if the numbers stack up. The pricing needs to be right. The accounting needs to be clean. And someone needs to be watching the profitability as the plan book grows.
Want help building a service plan that actually makes money? Let’s look at your numbers together.
If you are serious about building a better plumbing or heating business, the Together We Count books are your next step. The Quote Handbook helps you price your work with confidence — grab your copy on Amazon here. The Systems Handbook gives you the frameworks to run your business properly, available in Kindle, Paperback, and Hardback — get yours on Amazon here, or grab the Hardcover edition here.