One-off serviceBoiler service comparison
Compare annual boiler service prices and service plans from Gas Safe registered engineers. Keep your warranty valid and prevent breakdowns before they happen.
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One-off service
One-off serviceHometree Boiler Service
One-off serviceBritish Gas Annual Service
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Service plans are maintenance agreements, not insurance policies. Prices assume a standard domestic gas boiler in an accessible location.
What is an annual boiler service?
An annual boiler service is a safety and efficiency check carried out by a Gas Safe registered engineer. They inspect the controls, flue, seals, gas pressure and safety devices, clean any parts that need it and confirm the boiler is burning safely.
It usually takes 30 to 60 minutes and ends with a service record, which most manufacturers require you to keep in order for the warranty to remain valid.
Why is an annual service worth it?
Keeps your warranty valid
Almost every manufacturer requires a documented annual service. Miss one and a 10-year warranty can be void.
Prevents costly breakdowns
Small issues like a sticking valve or low pressure are caught before they become a £400 emergency callout.
Safety and efficiency
The engineer checks for carbon monoxide risks and makes sure the boiler is not wasting gas.
What does a boiler service include?
Safety checks
Flue integrity, ventilation and combustion are tested for carbon monoxide risk.
Gas pressure test
The engineer checks the boiler is operating at the correct pressure and burn rate.
Component inspection
Seals, electrodes, the heat exchanger and the condensate trap are inspected and cleaned.
Service record
You receive a written record for your warranty and, if you rent out the property, your compliance file.
Leak and pressure check
The system is checked for water leaks and correct pressure across radiators.
Advisory notes
The engineer flags any parts nearing the end of their life so you can plan ahead.
How does a boiler service work?
You book a slot online or through your service plan provider, usually within a few days.
A Gas Safe registered engineer attends and carries out the visual, safety and performance checks.
Parts that need cleaning are removed and cleaned, and the boiler is retested under load.
You get a service record confirming the work, which you keep with your warranty paperwork.
How often should a boiler be serviced?
Once a year is the standard recommendation, and it's a condition of virtually every manufacturer's warranty.
If you're a landlord, an annual Gas Safety Check (CP12) is a legal requirement — though that's a separate check from a full service, many engineers do both in one visit.
Late summer and early autumn are the best times to book, before engineers get busy with winter breakdowns.
How do I choose the best boiler service deal?
Check that the price includes a full service rather than just a safety check, that the engineer is Gas Safe registered, and whether a written service record is provided. If you'd rather not remember to book each year, a monthly service plan handles the reminder and the payment for you.
How can I save money on boiler servicing?
Book in the off-season when providers run promotions, and consider bundling the service into a cover plan — the combined monthly price is often less than paying separately for a service and repair cover. Keeping the boiler serviced also cuts your gas bill by keeping it running efficiently.
Considering a boiler service:
These guides might help.
Central heating cover
Central heating cover offers the security of having your boiler and heating maintained.
How to choose the right boiler insurance
Boiler insurance is a sensible precaution, but which plan gives you the best deal?
Gas safety tips that could save your life
What should you do if you smell gas? How can you protect against carbon monoxide?
FAQs
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Written by the Grow Your Business energy team · Updated on 21 March 2026