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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 ensures that the appliance is operating as intended. Peace of mind A boiler service can give you peace of mind that your heating system can be operated safely. It will also help you reduce your energy costs by making sure that your heating system is operating