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A proper annual service keeps your manufacturer's warranty valid, catches small faults before they become winter breakdowns, and typically pays for itself in efficiency. Landlord CP12 Gas Safety Records issued on the day.
Gas Safe · Manufacturer service intervals · Landlord CP12 · All major brands
What it is
Annual boiler servicing to manufacturer specification on combi, system and heat-only boilers — plus landlord Gas Safety Records (CP12) for private landlords and letting agents.
Who it's for
Homeowners protecting a manufacturer warranty, landlords who need a CP12 issued for a new tenancy or annual renewal, and letting agents managing multiple properties.
When you need it
Every 12 months, without fail, to keep the manufacturer warranty valid. Landlords are legally required to renew the CP12 annually and before every new tenancy.
Why use a professional
Skipping the service voids most manufacturer warranties, invalidates landlord compliance, and lets small issues become expensive winter repairs. A service is the cheapest boiler maintenance you'll ever pay for.
The cheapest time to deal with a plumbing or heating fault is almost always now. Water damage, gas issues and system stress compound quickly — the invoice grows with them.
If you leave it
Common DIY mistakes
You get the same sequence every time — so there are no surprises on the invoice and nothing missed on the job sheet.
Homeowners: pick a convenient day. Landlords: we can schedule around tenant access and diarise the annual renewal for you.
Case removed, appliance inspected for corrosion, leaks, correct clearances, flue integrity and CO alarm placement.
Flue gas analyser used to verify CO, CO₂ and ratio readings are within the manufacturer's tolerance — this is what proves the boiler is safe.
Burner, heat exchanger surfaces, condensate trap, ignition electrodes and seals cleaned or replaced as needed.
System pressure set, expansion vessel checked and re-pressurised if needed, magnetic filter cleaned, inhibitor level verified.
Service record signed off; landlords receive a CP12 Gas Safety Record on the day. Any issues flagged with a quote before we leave.
Manufacturers require an annual service by a Gas Safe engineer as a condition of warranty. We do it, log it and give you the paperwork.
A properly serviced boiler runs cleaner and hotter for less gas — typically 5–10% savings over a neglected unit over a full winter.
Failing expansion vessels, weak pumps, sludged systems and CO risks show up on a service long before they become an emergency call-out.
Gas Safety Records issued at the appointment. Digital and printed copies for your records and the tenant.
Vaillant, Worcester, Ideal, Baxi, Glow-worm, Alpha and others. Serviced to the manufacturer's service schedule, not a generic checklist.
If your boiler is nearing end of life, we tell you honestly, so you can plan a replacement rather than be caught cold in January.
A boiler service is a technical inspection, not a wipe-and-tick exercise. Here's what a real Gas Safe service includes and why each step matters.
The only way to verify a boiler is combusting cleanly and safely is to sample the flue gas with a calibrated analyser and check CO, CO₂ and the CO/CO₂ ratio against the manufacturer's published tolerance. Any service that skips this step isn't a service — it's a look-and-guess.
We remove the front cover and inspect the burner, heat exchanger fins, ignition and flame sensing electrodes, gaskets and seals for wear, corrosion or sooting. Anything worn is cleaned, adjusted or quoted for replacement — with your say-so before we spend a penny.
The boiler is only half of it. We check system pressure, re-pressurise and re-charge the expansion vessel where needed, clean the magnetic filter, and check inhibitor levels. These four items are where 90% of avoidable boiler failures start.
A Gas Safety Record (CP12) covers every gas appliance and pipe in the property, not just the boiler. We inspect and certify the cooker, hob, gas fire and pipework, log meter and appliance details and issue the record digitally and on paper. Records are legally required annually and before every new tenancy.
Nothing here is generic — these are answers we give West London customers every week.
Ask us directlyStandard annual boiler service is quoted at booking based on boiler type and location. Landlord CP12 with one appliance is slightly higher because of the additional certification and reporting time.
Around 45–60 minutes for a straightforward domestic combi. Landlord CP12s covering multiple appliances take a little longer.
You're not legally required to, unless you're a landlord (CP12 is mandatory). But manufacturers require an annual service to keep the warranty valid — skip one and you lose the cover.
Yes — all mainstream UK brands including Vaillant, Worcester Bosch, Ideal, Baxi, Glow-worm, Alpha and Potterton.
A service is a technical maintenance inspection of one appliance. A CP12 is a legal document certifying all gas appliances and pipework in a rental property are safe. We can do both in the same visit.
Yes — homeowners get a courtesy reminder 11 months later; landlord CP12s are diarised automatically so you never miss the renewal.
No pressure, no obligation. A Gas Safe engineer visits, scopes the job in person, and puts a written quote in your inbox — usually within 2–3 working days. For emergencies, call the line — it's answered 24/7 by the team, not a call centre.
Gas Safe · Manufacturer service intervals · Landlord CP12 · All major brands
