How Often Should I Service My Boiler to Keep the Warranty Valid? You’ve just invested in a brand-new, high-efficiency boiler. It’s quiet, it’s sleek, and best of all, it comes with a 10-year manufacturer’s warranty. You’re set for a decade of worry-free heating, right?
Not necessarily.
At MJS Appliance & Boiler Repairs LTD, we’ve seen dozens of homeowners lose out on free repairs because they missed one simple rule: The Annual Service Requirement.
If you want your warranty to remain more than just a piece of paper, here is everything you need to know about boiler servicing in 2026.
The Golden Rule: Once Every 12 Months
To keep a manufacturer’s warranty (from brands like Worcester Bosch, Vaillant, or Ideal) valid, you must have your boiler serviced by a Gas Safe registered engineer at least once every 12 months.
Think of it like an MOT for your car. If you don’t have the paperwork to prove it’s been checked annually, the manufacturer is legally entitled to void your warranty. If a major part fails in year five, you could be looking at a £500 bill that should have been free.
Why Manufacturers Insist on an Annual Check
It’s not just a “money-making scheme.” Manufacturers require yearly checks for three specific reasons:
- Safety: Checking for Carbon Monoxide leaks and ensuring the flue is clear.
- Efficiency: Cleaning the heat exchanger and adjusting gas pressure to ensure you aren’t overpaying on your energy bills.
- Component Longevity: Identifying small leaks or “sludge” build-up before they cause a total system breakdown.
Does it matter who services the boiler?
Yes. To keep your warranty intact, the service must be performed by a Gas Safe registered engineer.
At MJS, we provide a full service report and logbook entry upon completion. If the manufacturer ever asks for proof of maintenance during a repair claim, you simply show them your MJS service history, and you’re covered.
Pro Tip: Don’t wait until the middle of January to book. Manufacturers usually allow a “grace period” of a few weeks, but if you hit month 13 without a service, your warranty could be cancelled automatically by their system.
The Best Time of Year to Book
While you can service a boiler any time, we highly recommend booking your MJS service in late summer or early autumn.
- Beat the Rush: Once the first cold snap hits, emergency repair calls skyrocket, and wait times for routine services increase.
- Total Peace of Mind: You’ll know your system is “winter-ready” before you actually need to rely on it daily.
Protect Your Investment Today
Don’t let a £1,500 heat exchanger replacement come out of your pocket just because you missed a service date.
Is your boiler due for its annual check?
Keep your home safe, your bills low, and your warranty valid with a professional service from MJS Appliance & Boiler Repairs LTD.
