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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. A certified engineer checks the general safety of gas and ensures that the appliance is working according to its intended purpose. Peace of Mind A boiler service will give you peace of mind that your heating system is safe to use. It will also help you save money on energy costs by making sure your heating system is operating as efficiently as