Upper and lower water pipe draining device for solar water heater water tank

The utility model relates to a draining device for a water charging and discharging pipe for the water tank of a solar water heater. The utility model is characterized in comprising a reverse U-shaped water charging and discharging pipe which is arranged in the water tank, wherein, the top end of the reverse U-shaped water charging and discharging pipe is provided with a temperature controlling breather valve; the temperature controlling breather valve is provided with a valve body in which an air conducting passage is arranged; a valve core which is composed of a temperature sensing element is arranged on the air conducting passage, and the valve core can close the air inlet of the air conducting passage or the air outlet of the air conducting passage. The utility model has the advantages of accurate and reliable water draining action for draining the water charging and discharging pipe, accurate and reliable water filling action for the water charging and discharging pipe, simple structure, easy operation, and long service life.