You can go to the gas company or find a gas meter box, which says the gas meter corresponding to your home unit.
Hong Kong and China Gas Company Limited is a listed company in Hong Kong, and its main shareholder is Hong Kong and China Gas Company. Hua Gang Gas Co., Ltd. is a professional gas investment management group specializing in the investment, development and operation management of gas business. Its main business involves the construction and operation of urban pipeline gas. It is a subsidiary of Ganghua Gas Co., Ltd. established in Chinese mainland, aiming at comprehensively expanding and managing its business in China.