What is the reason why solar water is not hot?

Possible reasons are: 1, blocked by obstacles; 2. The water supply valve is damaged or not closed properly; 3. Poor water quality; 4. air pollution; 5, the water consumption is large; 6. Short illumination time; 7. The collection pipe is full of dust; 8, insulation layer quality problems. Suggested solution: 1, there is shelter above the water heater, or there is a lot of dust in the local air, and there is dust on the surface of the collector tube. Then clear the obstacles above or transfer solar energy. 2. Keep the water tank slowly filling or leaking downwards, and the hot water in the water tank overflows or leaks. Then replace the water ball valve. 3. Due to the poor water quality in the local area or the owner's home, there is scale in the vacuum tube, which reduces the heat collection efficiency. You can clean the inside of the vacuum tube. 4. The local air pollution is serious, and there is dust on the surface of vacuum tube, which affects the heat collection. Scrubbing the surfaces of vacuum tubes and polysilicon gratings. 5. All the hot water in the water tank is used up, that is, there is no basic water temperature, the capacity of the water tank is small, and the water consumption is large. Replace large-capacity water heater or install electric heating system. 6. It is mainly due to low irradiance or short illumination time in rainy and foggy weather. 7. There is dust on the surface of the collecting tube. When removing the collecting pipe, clean the surface with a little water. 8. When the vacuum degree drops, a new vacuum tube needs to be replaced.