solar water heater(Economical model)

1.    The high quality vacuum tubes absorb the solar ultraviolet ray; then heat the cold water in the vacuum tube.

2.    The hot water rise in the top of the water tank, and the cold water sink to bottom then heat by solar collector. So the whole system is always circulating continuously.

3.    The electromagnetism or ball valve can perform the water supply automatically, the water in the tank is not sufficient, the electromagnetism valve will open its valve, the tap water flow in the water tank, if the water is full, it will close the valve automatically

Certainly you can use it without assistant tank, only you open the water valve handly when the water in tank is not sufficient.