99600c1d_Collector___Solar_Water_Heater__Evacuated_Tube_Collector
[S.No] 15 [Flat Plate Collector] System life above 15 years [Evacuated Tube Collector] 
System life above 15 years.
Comparison between Evacuated Tube Collector & Flat Plate Collector - Solar Water Heater
Evacuated Tube Collector