The average service life of detectors and panels is about 10 years, batteries 3–5 years, and cabling longer still. Exact figures are given in each device's data sheet.
Actual lifespan depends heavily on maintenance. A system that is regularly tested and cleaned lasts a long time. A forgotten system can start giving false alarms after 3–4 years — or fail to respond to a real fire.
Practical tips
- Write the battery installation date directly on the power supply housing.
- Replace detectors older than 10 years on a planned basis rather than waiting for failures.
- Regular maintenance extends the life of the whole system.