99600c1d_Collector___Solar_Water_Heater__Evacuated_Tube_Collector
[S.No] 4 [Flat Plate Collector] Convection and Convecting losses is high. [Evacuated Tube Collector] 
Convection and Convecting losses is low.
Comparison between Evacuated Tube Collector & Flat Plate Collector - Solar Water Heater
Evacuated Tube Collector