CDC: The water in the water tank of solar water heater flows irregularly, and there are many impurities and rusty iron in the water. Drinking it will have an impact on your health, so you'd better not drink it.
The water tank liner of solar water heater generally adopts food-grade stainless steel SUS3042B, which is the material of stainless steel lunch box. If it is a regular manufacturer's water heater product, it can be guaranteed that it is made of food steel, which is no problem to drink. This is for the water tank liner; Secondly, vacuum tubes, generally all-glass vacuum tubes, are straight-inserted, and their structures are like thermos bottles. Vacuum coating is on the reverse side of the innermost glass, which is isolated from water, just like the heat preservation principle of thermos. Therefore, for vacuum tubes, there is no pollution to water and they can be drunk. Then there is a silicone ring used to seal the connection between the vacuum tube and the water tank. The material is similar to the bottle stopper of medical physiological saline and glucose, which is the kind of bottle for hanging drops and will not pollute the water. Generally, in summer or even in late spring and early autumn, the water in the water heater is easily heated to boiling. Theoretically, the water in the solar water heater is drinkable.
However, there are several points to note: 1, which is not linear. For example, pressure-bearing water heaters are mostly balcony wall-mounted Because copper pipes are used as pressure-bearing circulating waterways, there will be copper rust, which will have an impact on human health; 2. Due to the cost problem, many small-scale solar energy manufacturers hang sheep's heads on materials to sell dog meat, and use stainless steel and silica gel rings that do not meet the hygiene and safety standards for drinking water. Moreover, due to poor foaming technology, polyurethane insulation layer can not completely isolate water. This kind of water heater is definitely not drinkable, and it is not good to wash dishes. If the water heater is not used for many days, the water in it can't be drunk.
The easiest way to know whether the water in the solar water heater can be drunk is to see whether this brand or model of solar water heater has passed the drinking water safety certification of the relevant health departments.
Solar hot water does provide convenience for people's living water, but the water stored in the water tank of solar water heater belongs to secondary storage, so the residual chlorine originally used for disinfection and sterilization in tap water will naturally decompose after storage for a period of time, and it will not play a role in disinfection; Secondly, because the temperature of the water in the water tank rises after overheating reaction and it is soaked in hot water for a long time, some chemical reactions will occur between the coating, viscose and plastic water pipes in the water tank, releasing some harmful substances and dissolving them in the water; In addition, there are two kinds of plastic water pipes in China, which are' drinkable for life' and' undrinkable for life'. However, most of the water pipes of solar water heaters have no clear approval. Many users regard solar water heaters as necessary supporting equipment in their communities without carefully checking the quality reports of related products when buying houses. So remind everyone that it is best not to use solar hot water for entrance-related drinking, such as washing vegetables, cooking and boiling water. And you can't drink it directly. It is ok to use it only for bathing, washing clothes and cleaning household hygiene.
Most of the water in solar water heater belongs to secondary heating, mainly because the water heater has been used for many years, and some of it is old water (that is, unused water), and dirt will accumulate, including many harmful substances; In addition, even if the water in the water heater reaches 100 degrees, the heating time is very long. In this process, a large amount of nitrite will be produced, and nitrite is the main killer threatening human health. The experts of secondary distilled water at home don't recommend it, let alone the solar water heater, which is a container out of the harsh environment.