Boiler Service Cost Calculator
Estimate an annual boiler service by boiler type
Last updated: July 2026
How much does a boiler service cost?
An annual boiler service keeps your heating safe, efficient and – often overlooked – keeps the manufacturer’s warranty valid. A one-off service usually costs £60–£120 depending on the boiler type and your area, and is frequently cheaper when bundled into a cover or heating plan. This calculator gives an indicative price for your boiler, and clears up the common confusion between a service and a gas safety check – they are not the same thing. It sizes the cost; it is not a quote.
What you need to know
- Priced by boiler type – combi boilers are usually cheapest; oil and LPG boilers cost a little more.
- Service vs safety check – a gas safety check (CP12) only confirms safety; a service also cleans, tests and tunes the boiler for efficiency and reliability.
- Warranty – most manufacturers require a yearly service by a Gas Safe engineer, so skipping one can void an otherwise valid guarantee.
- Cheaper in a plan – boiler cover and heating plans often include the annual service, spreading the cost.
Worked example
A homeowner books a one-off service for a combi boiler before winter. That is around £60–£100. A landlord with the same boiler who also needs the annual CP12 gas safety certificate pays roughly £40–£80 more, and saves by having both done in one visit. In both cases the yearly service keeps the boiler efficient and the warranty intact – small money against a mid-winter breakdown.
Frequently asked questions
How much does a boiler service cost?
A one-off annual boiler service typically costs between about £60 and £120 in the UK, depending on the boiler type and your area. It is often cheaper as part of a boiler cover or heating plan, and combi boilers are usually at the lower end.
Is a boiler service the same as a gas safety check?
No. A gas safety check (the landlord CP12) confirms appliances are safe, while a service also cleans and tests the boiler, checks combustion and efficiency, and helps prevent breakdowns. Landlords often have both done together, but they are separate jobs.
How often should I service my boiler?
Once a year is the standard recommendation, and most manufacturers require an annual service by a Gas Safe registered engineer to keep the warranty valid. Servicing before winter is popular so faults are caught before you rely on the heating.
Does a boiler service keep my warranty valid?
Usually yes. Most boiler manufacturers make an annual service by a Gas Safe registered engineer a condition of the guarantee, so missing a service can invalidate an otherwise valid warranty claim. Keep the service records as proof.
What is included in a boiler service?
A typical service includes a visual inspection, checking gas pressure and flow, testing the flue and combustion, inspecting seals and controls, and cleaning components as needed. The engineer confirms the boiler is running safely and efficiently and flags any faults.
Is a boiler service worth it?
Yes for most homes – it keeps the boiler efficient (saving on gas), catches small faults before they become expensive breakdowns, protects your warranty and confirms it is safe. The modest annual fee is small against a mid-winter breakdown or a voided guarantee.
Cost figures are indicative UK market ranges for 2026 and vary by area and boiler – they are not a quote. Always use a Gas Safe registered engineer; landlord gas duties are at GOV.UK – Landlord responsibilities.