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The evacuated tube is the main component of the vacuum tube collector. There is no flow of water through the evacuated tube. Heating system is independent with circulation system, and the entire system is connected by all metals, so that it has a stable and reliable operation. This feature makes evacuated tube collector function play more stable. Moreover, it should be more explained that, if evacuated tube is damaged, the collector job will not be interrupted. Because the insulation box is filled with the insulation material, it effectively reduces heat loss during operation. - See more products at en.micoe.com/watertank/