Rooftop solar water heater

1. sunlight concentrators make the efficiency doubly increased.
2. Fast assembly CPC concentrators more easy installation and transportation.
3. 360°sunlight absorber, hot water in cloudy days.
4. Overheating protection just disassembly the CPC concentrators in summer.
5. Temperature startup more faster than the normal solar thermal collectors.
6. Applicable for the industry heating.
7. More thermal production based on the same aperture area.