Your Gas Boiler and Central Heating System, just like your car, need a little TLC from time to time to ensure they're running as they should be.
And, just like your cars MOT, the primary reasons for this are efficency and safety. Deposits build up inside the boiler and central heating system which reduce the
efficency of the system. An annual service will make sure the boiler is running as it should be.
Regular servicing also greatly reduces the risk of a breakdown and prolongs the life of the boiler. The other reason is safety and for that reason it's absolutely essential you have your gas boiler serviced at least once a year.
While modem boilers are incredibly safe and highly unlikely to have safety issues after installation there's always a small chance something can go wrong. An annual gas boiler service severely reduces the chances of a problem and forthcoming problems can be identified.