http://www.drugoffice.gov.hk/g....b/unigb/www.mkgassaf
https://www.metooo.es/u/672f8ce9da295e118f550b95
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. certified engineer checks the general security of gas and makes sure that the appliance is operating 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 also helps you save money on energy cost
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