An annual oil boiler service by a qualified engineer will optimise efficiency, improve safety and help prolong the life of your heating system. A trained engineer will carry out combustion checks, clean burners and heat‑exchangers, replace worn seals and filters, and ensure controls and the flue are working correctly — actions that reduce fuel use, cut emissions and lower running costs. Regular professional servicing also identifies small faults before they become major failures, prevents dangerous issues such as oil leaks or carbon monoxide risks, and helps maintain manufacturer warranties. For best results, arrange routine maintenance annually and fit a working carbon monoxide alarm as an added safety measure.