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Service your boiler.
Annual Gas Safe service — checks combustion, seals, pressure and flue safety. Keeps warranty live.
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Top tips
Hiring a central heating, without the regret.
Four moves that separate a smooth job from a nightmare.
Service skipped, warranty void
Manufacturer warranties (10 years on Worcester Bosch) require annual service. Missing one voids the cover.
Cheap "service" no boiler open
A proper service requires removing the cover and checking internal components. Visual-only is not a service.
Combustion analyser readings not recorded
Quality service includes FGA readings (Carbon monoxide, oxygen, efficiency). Missing means corners cut.
Condensate trap blockage
Causes boiler lockout in winter. Cheap service often skips this — clogged trap is a winter emergency call-out.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Combi boiler serviceMost common UK call-out
£80–£140
System boiler serviceIncludes cylinder check
£90–£180
Combi + landlord gas safety certCP12 certificate
£120–£200
Oil boiler serviceMore involved than gas
£150–£300
Service contract annualPlus boiler cover
£120–£300
Boiler cover plan annualService plus repair
£150–£500
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
InfographicThe Central Heating briefing.
Infographic
Central Heating quick-view
Annual boiler service is the cheapest investment to extend boiler life and maintain warranty. Expect to pay £80–£200 for a UK boiler service depending on boiler type and location. Worcester Bosch and Vaillant warranties typically void without annual service.
What Does the Work Involve?
Gas Safe engineer visits, removes boiler cover, visually inspects the heat exchanger, burner, ignition, electrodes, fans, condensate trap. Cleans the condensate trap. Inspects flue. Checks gas pressure (correct burner combustion). Measures combustion using flue gas analyser (CO/CO2 ratios, efficiency). Records readings on Gas Safe Service Record. Replaces gaskets if needed. Boiler runs through full cycle to verify.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Combi boiler service | 80 | 140 | Most common UK call-out |
| System boiler service | 90 | 180 | Includes cylinder check |
| Combi + landlord gas safety cert | 120 | 200 | CP12 certificate |
| Oil boiler service | 150 | 300 | More involved than gas |
| Service contract annual | 120 | 300 | Plus boiler cover |
| Boiler cover plan annual | 150 | 500 | Service plus repair |
| British Gas HomeCare | 200 | 500 | Premium boiler/heating cover |
How Long Does It Take?
Standard service: 45–90 minutes. Landlord CP12 service: 1–2 hours. Includes paperwork.
DIY or Professional?
Gas Safe registered only. Annual service requires manufacturer-specified procedures and certification.
Choosing the Right Tradesperson
Gas Safe registered with manufacturer accreditation for warranty validity. Worcester Bosch Approved, Vaillant Advance, etc. Get the boiler-specific service record signed.
UK Regulations
Gas Safety (Installation and Use) Regulations 1998: annual landlord gas safety certificate (CP12). Homeowner servicing is not legally required but is best practice and most warranties demand it.
Common Problems
- Service skipped, warranty void: Manufacturer warranties (10 years on Worcester Bosch) require annual service. Missing one voids the cover.
- Cheap "service" no boiler open: A proper service requires removing the cover and checking internal components. Visual-only is not a service.
- Combustion analyser readings not recorded: Quality service includes FGA readings (Carbon monoxide, oxygen, efficiency). Missing means corners cut.
- Condensate trap blockage: Causes boiler lockout in winter. Cheap service often skips this — clogged trap is a winter emergency call-out.
Frequently Asked Questions
Do I need annual boiler service?
For warranty: yes. For safety and efficiency: strongly recommended. Most boiler failures are gradual; service catches them before breakdown.
What's checked during a service?
Combustion (gas-air mix), heat exchanger condition, ignition, condensate trap, gas pressure, flue, casing seal, ventilation. Combustion analyser readings recorded.
When should I service my boiler?
Late summer or early autumn — before winter when call-outs are slow. Anniversary of installation is a good prompt.
Service plan vs single visit?
Service plan: cheaper if you also want minor repair cover. Single visit: cheaper if you trust your boiler. Plans often include MagnaClean clean.
British Gas vs local plumber?
British Gas: higher cost, 24/7 emergency cover. Local plumber: cheaper, may not have same response time. For new boilers under manufacturer warranty, the original installer often offers best service plan.
Will service fix any boiler?
No — service prevents future issues and catches early-stage problems. Existing faults need repair, separately charged.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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