When vacuum tube absorb solar energy and heat the heat pipe ,the working fluid vaporizes and rise to the top of the heat pipe condenser, when heat pipe condenser meet cold water and cool down, the  working fluid will fluidity and return to the bottom of the heat pipe, so once and once again to repeat this process.

The pressurized solar water heater system has an inner tank, which is made using 1.2mm SUS316 stainless steel using the latest automatic welding technology throughout the welding process. The tank has been high pressure tested to 10 bar.

Download 300 Liters Sunrain Pressurized Heat Pipe Solar Water Heater datasheet here >>>

Download 300 Liters Sunrain Pressurized Heat Pipe Solar Water Heater manual here >>>