Boiler Service London

A standard annual boiler service in London costs £85–£120 with Trusted Plumber London. The price includes a full safety check, cleaning of key components (heat exchanger, burner, flue), combustion analysis, pressure and temperature verification, and a written service report. A combined boiler service + CP12 Gas Safety Record for landlords costs £120–£150 depending on property type.

All major boiler manufacturers (Worcester Bosch, Vaillant, Baxi, Ideal, Viessmann) require an annual service to maintain your warranty. Gas Safe regulations require landlords to service boilers annually and issue a new CP12 Gas Safety Record each year. Even without a warranty, annual servicing reduces breakdown risk by around 50% and keeps the boiler running at peak efficiency — a poorly maintained boiler can cost an extra £100–£200 per year in gas bills.

A Gas Safe boiler service includes: visual inspection of the boiler, flue and pipework; checking gas pressure and flow rate; testing all safety devices (pressure relief valve, overheat thermostat, fan pressure switch); cleaning the heat exchanger, burner and condensate trap; combustion analysis to verify efficient and safe burning; checking the expansion vessel pre-charge; and issuing a written service report. We also top up inhibitor if needed and advise on any parts approaching end of life.

Yes. We issue CP12 Gas Safety Records (also called a Gas Safety Certificate or Annual Gas Safety Check) on the same day as the service inspection. The certificate must be issued by a Gas Safe registered engineer and must include the engineer's Gas Safe licence number, the date of inspection, and the results of all appliance checks. We send a digital copy immediately after the job and a physical copy by post if required.

For boilers under 15 years old, annual servicing almost always makes financial sense. For boilers 15–20+ years old, we'll give you an honest assessment: if the heat exchanger is cracked or key parts are obsolete, we'll tell you a replacement is better value. We never recommend unnecessary repairs. A new A-rated combi boiler installed by our Gas Safe engineers typically saves £200–£350 per year versus a 20-year-old G-rated boiler.

If we identify a safety issue during the service (e.g. a cracked heat exchanger, a failed safety valve, inadequate flue terminal clearance), we will tell you exactly what was found and what needs to be done. We won't condemn a boiler unnecessarily, but we will issue an 'Immediately Dangerous' (ID) or 'At Risk' (AR) notice if the law requires it. In those cases we'll quote for the repair on the spot and can often carry out straightforward fixes the same day.