Most of the products in the domestic water heater market are traditional floating ball type electric heating products. The drinking water flowing out of these water heaters is “yin and yang water” (that is, water mixed with raw water and boiling water). If people drink such water for a long time, Harm to health. Professor Li Zhongqin, a water treatment technology expert at the South China Sea Branch of the State Oceanic Administration, expressed his concern to the reporter.
Always drink "half-boiled" water
Professor Li showed the working principle of the water heater: the water tank of the water heater has no compartment, and there is a float switch on the top right side. If the hot water flows out from the faucet, the top float will fall, and the on-off valve will open. The raw water flows directly into the water tank, filling the water tank so that the floating ball continues to float on the top. When raw water is mixed with drinking water, it becomes yin and yang water. Those who open the faucet and drink water in the future will always drink "half-boiled" water.
It is understood that most of the products in the domestic water heater market are traditional floating ball type electric heating products. It is impossible to completely separate the raw water from the drinking hot water, and the "open water" flowing out reaches less than 100 degrees Celsius.
In schools, large group companies, hotels, the use rate is higher, reaching more than 80%. Because of the high power consumption, large size and relatively low price of this product, the current usage rate in schools, large group companies and hotels is high, reaching 80%. the above. According to Mr. Li, a distributor of “Boiling Water”, in the market of Guangzhou, there are only 2 to 3 brands of “boiling water” that can be completely separated from raw water and boiled water. Most brands are “yin and yang water”. "Because the price of "all boiling" is a few hundred dollars more expensive than usual, the water heater that burns "yin and yang" will be popular.
Long-term drinking of this kind of water is easy to infect bacteria, and serious infection may even cause hepatitis. Huang Wei, deputy director of the Nutrition Department of the First Affiliated Hospital of Jinan University, told reporters that the water that is not boiled contains a variety of microorganisms, pathogens and a large number of bacteria. Drinking this water for a long time is easy to infect bacteria, and even severely infected with hepatitis.
The reporter learned from the China Consumers Association that last year the State Quality Inspection Bureau conducted a supervised spot check on the quality of commercial water heaters and liquid heaters, and randomly selected 77 products from 40 enterprises in four provinces and municipalities including Beijing, Shanghai, Jiangsu and Guangdong. There are 43 kinds of qualified, and the sampling rate of products is only 55.8%. One of the problems is that most of the water heaters use a float switch type inlet valve, which cannot completely separate the raw water from the drinking water. China Consumers Association also issued a consumer warning for this in April this year.
Chen Caixing, the person in charge of the Guangzhou Consumer Council, believes that the main reason is the lack of domestic boiler industry standards. At present, the standards referenced by domestic water boiler enterprises are mainly national electrical safety standards. Only "safety of electricity use" is considered, but there is no standard for drinking water safety. Professor Li Zhongqin, a national water treatment technology expert, believes that the water heater is an electric heating product and an important drinking water device. According to its structure and function, the standard standards for the implementation of the product should be two-fold, which must meet the special requirements of commercial electric water heaters and liquid heating appliances, as well as the strict requirements for sanitary safety products involving drinking water.
