Core Viewpoint - The China Consumers Association has released a comparison test result for gas water heaters, indicating that the overall quality of 20 tested samples is good, and consumers are advised to choose products based on their specific usage needs [1] Group 1: Selection Criteria for Gas Water Heaters - Consumers should select appropriate capacity and size; for a one kitchen and one bathroom unit, a model with 10-13 liters is generally sufficient, while for one kitchen and two bathrooms, a model of 16 liters or more is recommended [2] - It is important to choose the right type; condensing gas water heaters have higher thermal efficiency compared to non-condensing types, making them suitable for larger households with higher hot water demand [3] - Consider zero cold water demand; some models can preheat the water line to reduce waiting time, but may require additional plumbing and can increase gas consumption [4] - Environmental factors should be taken into account; for instance, in northern regions where freezing may occur, products with automatic anti-freezing measures are recommended [5] - Focus on comfort features such as constant temperature control and skin care functions; water treatment features can improve water quality and provide additional benefits [6] Group 2: Safety and Certification - Consumers should purchase products through official channels and ensure they have the CCC certification; products without this certification should not be sold or installed [7] - It is advised not to install gas water heaters in enclosed spaces for aesthetic reasons and to consider adding gas and carbon monoxide alarms for safety [7] - The recommended lifespan for gas water heaters is 8 years from the date of sale, and units exceeding this age should be replaced [7]