What is the maintenance of the solar collector?
Under normal circumstances no maintenance of the system is required. Every few years you should change the heat transfer fluid water mixture. Due to the circular shape of the tubes, regular rainfall should keep the tubes clean. Should a vacuum tube become damaged in a storm after being hit by a large branch or loose its vacuum (note the silver tip on the bottom of the tube turns white), efficiency will be slightly reduced, but the collector can still operate with several broken tubes.
