If you allow somebody who is not  a Gas Safe-registered engineer to inspect or work on a gasoline boiler, cooker or fireplace in your house, they might not be qualified to do the work safely. https://tinhdoanhatinh.vn/index.php?language=vi&nv=news&nvvithemever=t&nv_redirect=aHR0cDovL2RlbHBoaS5sYXJzYm8ub3Jn