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What's the Difference Between a Boiler Service and Gas Safety Check? Gas safety checks are required on all gas appliances at least once every 12 months. An engineer certified by the EPA checks the general safety of gas and that the appliance is operating according to its intended purpose. Peace of mind A boiler service can give you peace of heart that your heating system is safe to use. You can also save money by ensuring that your heating system functions as efficiently as possible. A boiler that is regularly maintained is less likely to bre