Best China Rooftop Pressurized Solar WaterHeater 

Features:
1) Pressurized tank, working pressure 6 bar, Max resistance 12bar.
2) Reliable and efficient twin-glass solar tubes.
3) Copper heat pipes for rapid heat transfer ,No water through thetube,so it can good working in winter without freeze.
4) Easy plug-in installation.
5) Free maintenance.
6) Stable solar conversion during the day.
7) Ideal for home applications.

How it works:
1)Connect with tap water piping directly. Water is fedautomatically by the water pressure. The vacuum tubesabsorb  the sun energy and transfer the heat to the tank viathe copper heat pipe and the water temperature of  tank isgradually heated.
2)If the water is expand and pressure rise to more than 6 bar. ThePT valve will release automatically.
3) The electric heater can be operated for backup heating.