Annual Boiler Servicing
& Gas Safety Checks
from £95, Gas Safe.
A proper boiler service: stripped, cleaned, tested and recorded, not a five-minute visual check. Keeps your warranty valid, cuts your gas bill, and catches faults before they leave you cold on a Sunday night.
Boiler Service, explained properly.
A boiler service is an annual inspection, clean and combustion test carried out by a Gas Safe registered engineer, the manufacturer-required check that keeps your warranty valid and confirms the appliance is running safely and efficiently.
Every homeowner and landlord with a gas boiler in Oxfordshire. Combi, system and regular boilers all need annual servicing regardless of age.
Once every 12 months. Landlords must also renew the CP12 gas safety certificate annually. We'll remind you when you're due so nothing slips.
A cheap 'visual' service is worthless. A real service means removing the case, cleaning the burner and heat exchanger, checking gas rate, running a flue gas analyser, verifying seals, and completing the benchmark record. That's what the manufacturer requires, and what actually stops the boiler failing in January.
The cost of ignoring it.
The reason boilers 'suddenly' fail in the coldest week of the year is that nobody looked at them in the warm months when the fault was still cheap to fix.
Voided warranty
Miss a single annual service and the manufacturer can refuse warranty claims. On a 7-year cover that's a big financial risk for the sake of £95.
Carbon monoxide
A dirty burner, cracked heat exchanger or blocked flue can spill CO into the home. A proper service picks this up before it becomes dangerous.
Winter breakdown
Blocked condensate traps, weak diaphragms and tired pumps show up in a service. Ignored, they fail on the coldest weekend of the year when engineer availability is thinnest.
Wasted gas
A boiler running out of range on flow temperature, gas rate or air/fuel ratio can waste 10–20% of the gas you pay for.
Common mistakes we see
- •Booking a 'visual only' service that never opens the boiler case
- •Skipping a year because 'it's still working'
- •Losing the benchmark logbook and then trying to claim on warranty
- •Assuming a landlord CP12 replaces a boiler service, it doesn't
- •Using an installer who isn't approved for your boiler brand
How we run the job.
- 01
Booking & reminder
Book online or by phone. We schedule a slot to suit and, if you like, add you to an annual reminder so you never miss a year.
- 02
Full strip & inspection
Case off, burner and heat exchanger visually and mechanically inspected, seals and gaskets checked, condensate trap cleaned.
- 03
Combustion & gas rate test
Flue gas analyser test recorded, gas rate measured against manufacturer spec, standing and working pressures logged.
- 04
Controls & safety devices
Interlock, thermostat, expansion vessel pressure, flame failure device and safety cut-outs tested.
- 05
Benchmark record
Service page in your benchmark logbook completed and dated, the document the manufacturer needs for warranty claims.
What you actually get.
Warranty stays valid
Full manufacturer-compliant service, dated and logged, protects your 7–10 year cover.
Lower gas bills
A correctly tuned boiler modulates properly and stops wasting fuel at part load.
Fewer breakdowns
Small faults are caught while they're still cheap fixes, not January emergencies.
Carbon monoxide safety
Flue integrity and combustion are verified with a calibrated analyser, not a guess.
Same engineer next time
Continuity, we know your boiler, its quirks and its history year on year.
Fixed price
£95 covers a standard domestic combi service. If access or additional works are needed we'll quote before starting.
Depth, not filler.
What you're actually paying for on a real annual service, and where corners are commonly cut.
What we strip & clean
Combustion chamber, burner, injectors, condensate trap, and where accessible the heat exchanger fins. Rubber seals inspected and replaced as needed.
What we measure
CO ppm, CO/CO₂ ratio, flue temperature, gas rate at meter, inlet working pressure, static and running system pressure.
What we test
Flame failure device, overheat thermostat, expansion vessel charge, PRV operation, condensate route, interlock with room stat and cylinder stat.
Combi vs system vs regular
A combi service focuses on the plate heat exchanger and diverter. A system boiler service adds cylinder controls. A regular boiler service adds F&E tank and open-vent checks.
Hard-water areas
Oxfordshire's hard water scales plate heat exchangers. If we see the signs, we'll recommend a scale reducer rather than waiting for a failure.
Older boilers
Boilers over 12–15 years old often no longer justify servicing. If yours is on borrowed time we'll be straight with you about repair vs. replace, no scare tactics.
Landlord servicing (CP12)
Legally you need an annual gas safety inspection. A service is separate but sensible to combine, see our Landlord CP12 page.
Straight answers.
How much does a boiler service cost?
A standard domestic combi service is £95 fixed price. System and regular boilers, or homes with awkward access, are quoted transparently if the price differs.
How long does a service take?
Allow around 45–60 minutes for a proper service. Anyone in and out in 15 minutes hasn't done the job properly.
Do I need one every year?
Yes to keep manufacturer warranty valid, and yes for safety on any gas appliance. Landlords are legally required to renew a CP12 annually.
Does servicing include the CP12?
Yes, for landlords we can carry out the annual service and the CP12 in the same visit. Ask when you book and we'll price both together.
What if you find something wrong?
We'll show you, explain it, and quote a fixed price to fix it. You decide, we won't do surprise work without agreement.
Do you service every brand?
Yes, Vaillant, Worcester Bosch, Ideal, Baxi, Alpha, Glow-worm, Viessmann and more. We're approved on Vaillant and Worcester Bosch specifically.
Can I book a reminder each year?
Yes. Ask to be added to our annual reminder list and we'll contact you ahead of the anniversary each year.
What paperwork do I get?
A completed benchmark logbook page and a service certificate for your records, everything a manufacturer or insurer would ask for.
Related services
All servicesLocked-out combi, no hot water, weeping seal, fault code you don't understand? Gas Safe registered diagnostics, fixed price in writing, and the parts on the van to finish the vast majority of repairs on the first visit.
Learn moreNew A-rated boilers installed by Vaillant and Worcester Bosch approved engineers.
Learn moreFixed-price CP12s issued on completion and uploaded digitally, and can be carried out alongside an annual service, so you stay compliant, keep tenants safe, and avoid the fines and insurance disputes that unrecorded gas work invites.
Learn moreGet a fixed-price quote for boiler service in Witney, Oxford.
Free, no-obligation quote in writing. Gas Safe, MCS certified where relevant, fully insured to £5m. Local team, real engineers, no call centres.