Annual Boiler Servicing

Once a year, in line with manufacturer requirements for most warranties. Servicing annually, even on an older boiler with no warranty condition attached, is the most reliable way to catch wear before it causes a breakdown.

No. A service is manufacturer-recommended maintenance on the boiler itself. A landlord gas safety check (CP12) is a statutory check of every gas appliance in a rented home. Both can be carried out on the same visit where relevant.

Undetected wear can continue longer than it should, and a missed service can affect a manufacturer warranty claim if a fault later occurs. It is still worth booking the next service; it should simply be treated as due.

Not necessarily. A service is a planned check and clean, not a diagnostic repair visit. If the boiler has a fault, such as a lockout code, no heat or low pressure, it should be booked as a repair call rather than waiting for a scheduled service.

Yes. Every service includes a written record of the checks and readings taken, including the combustion analysis result, which should be kept for warranty purposes and as a maintenance history for the property.

Yes. A service plan schedules and reminds you of the annual visit rather than leaving it to be booked ad hoc. The scope of the visit itself is unchanged.

A standard domestic boiler service usually takes under an hour, though this can vary if the engineer identifies something that needs a closer look or a repair quote.

Yes. ComGas is a Vaillant Advance installer and services Vaillant boilers alongside the other major makes. An annual service by a Gas Safe registered engineer, recorded in the boiler's logbook, is a condition of most manufacturer guarantees, including Vaillant's, so keeping to the service date is what keeps the guarantee in place.