You should service your boiler at least once a year , ideally every 12 months, to keep it safe, efficient, and within warranty requirements in most cases. Many heating and safety guidelines, plus landlord and insurance requirements, are also based around this yearly schedule.

Quick Scoop

  • Aim for a full boiler service every 12 months , not longer gaps like 18–24 months.
  • Annual servicing helps spot gas or water leaks, carbon monoxide risks, and early faults before they turn into expensive breakdowns.
  • In many places, gas or oil boilers must be checked yearly by law for landlords and commercial setups, and skipping services can affect warranties and insurance.
  • Electric boilers are sometimes not legally required to be serviced yearly, but technicians still strongly recommend annual checks for reliability and lifespan.
  • A standard service usually takes around 30–60 minutes , depending on boiler type and condition.

Best timing for servicing

  • Try to book your service before peak winter , often in late summer or early autumn, so problems are fixed before heavy use.
  • Keep a written record of each service and always book the next one within 12 months of the last date , not just “once a year whenever.”

When to call sooner than yearly

Even if your last service was recent, get your boiler checked early if you notice:

  • Strange noises, smells, or frequent pressure drops
  • Pilot light or flame changing colour or going out repeatedly
  • Radiators not heating properly or hot water cutting out
  • Any signs of leaks, soot, or scorch marks around the boiler

These can be early warnings of safety or performance issues and should be checked by a qualified engineer promptly.

Quick note on different setups

  • Gas or oil domestic boilers : Annual service is standard and strongly recommended (and often required for landlords).
  • Steam or larger industrial boilers : Also typically serviced at least yearly , sometimes more often depending on usage and regulations.

Bottom line: If you are asking “how often should you service your boiler,” the safe, widely recommended answer is every 12 months , with extra checks any time something seems off.

Information gathered from public forums or data available on the internet and portrayed here.