The annual service opportunity
If you've been servicing boilers for more than a year, you're sitting on a goldmine you might not be mining.
Every customer whose boiler you serviced last year is due a service again this year. They've already trusted you with their home. They already have your number. And they need this service — by law, if they're a landlord, or simply for their boiler warranty if they're a homeowner.
The average annual boiler service in the UK is worth £80–£120. The average UK heating business has 400–1,200 past customers on their books. That's £32,000–£144,000 in predictable annual revenue — if you reach out at the right time.
Most businesses capture less than 30% of this revenue. Not because customers don't want the service, but because nobody tells them it's time to book.
Why most businesses miss this
The typical approach:
- You service the boiler in October 2024
- You mean to follow up in October 2025
- September arrives and you're busy
- October arrives and you're very busy
- The customer books with a competitor who did follow up
There's nothing malicious here — you're just busy running your business. The problem is structural: manual follow-up at scale doesn't work.
The CallWrk Outbound solution
CallWrk's Outbound Campaigns module pulls your past service records, identifies customers due for a renewal, and sends a personalised SMS at the right time:
*"Hi [Name], it's [Business]. Your annual boiler service is due — we have appointments available next week. Reply YES to confirm or call us to choose a time."*
When the customer replies, CallWrk's AI handles the full booking conversation — confirming the address, picking a slot, sending a confirmation, and updating your CRM.
You see a booked job appear in your diary. Nothing else required.
Real results
AirFlow Heating in Leeds ran their first annual service campaign in September 2024:
- 680 past customers contacted
- 31% booking rate (211 services booked)
- Revenue: £19,000 in 6 weeks
- Time spent by office staff: 0 hours
The CallWrk Outbound subscription costs from £139/month for Growth plan customers. At 211 services × £90 average, that's a massive return on the first campaign alone.