The newly launched national patented product "solar automatic pipe emptying device" completely and conveniently solves the problem of freezing and blocking of solar outdoor pipes in cold seasons, and is known as the "winter anti-freeze expert". Basic principle: The main water pipe uses the siphon principle to supply and discharge water. Install a solenoid valve on the main water pipe in the upper part of the water tank, and install another solenoid valve on the indoor main water pipe. Press the emptying button on the controller panel. The upper and lower valves are opened at the same time to realize the air intake of the upper valve and the drainage of the lower valve. After a delay of 3 minutes, the controller will automatically close the double valves at the same time to complete the emptying of the pipeline.