Boiler lifespan: how long does it last?
Boiler: 15 to 20 years on average, so around 15 years in normal household use. Regular maintenance routinely pushes past the top of that range.
A gas boiler lasts 15 to 20 years on average. Recent condensing models routinely reach 20 years when serviced annually.
In France, an annual boiler service is a legal obligation. It is carried out by a professional who issues a certificate, a document insurers often ask for after a claim.
Signs it is reaching the end
- The boiler locks out on a fault more and more often
- Heating takes far longer to come up to temperature
- Gas consumption rises with no change in habits
- Kettling or whistling noises appear (limescale build-up)
- System pressure drops regularly (a leak)
The maintenance that extends its life
Annual service by a professional (legally required in France)
How often: once a year
Check system pressure (between 1 and 1.5 bar)
How often: monthly during the heating season
Bleed the radiators
How often: once a year, before winter
Power-flush the system
How often: every 5 to 10 years
Repair or replace?
Under 15 years, repair is nearly always the right call: parts (control board, valve, pump) remain far cheaper than a new boiler. Past 20 years, replacement is justified by the energy savings and by access to home-renovation grants.
A boiler is not covered by the French repair bonus, which targets everyday electrical and electronic equipment. Its annual service is compulsory, though, and other grants exist to help replace it. See the list of covered appliances.
Common faults
Frequently asked questions
How long does a gas boiler last?
Fifteen to twenty years on average, and up to 20-25 years for a well-serviced condensing boiler. The annual professional service is the deciding factor.
Is an annual boiler service compulsory?
In France, yes. Gas, oil and wood boilers must be serviced every year. It must be done by a qualified professional who issues a service certificate, generally required by your insurer after a claim.
When should you replace a boiler?
Past 20 years, or when breakdowns become repeated and consumption climbs noticeably. Replacing it with a condensing model or a heat pump may also qualify you for energy-renovation grants.