Thermal anti-freeze media is used in the inner tube to Vacuum Tube. No water flows into Vacuum Tubes. The manifold made of Aluminum Alloy to strength its structure. There is ventilation tunnel to maintain the system pressure level.
Heat pipe solar collector transform solar radiation into heat and transfer that heat to a medium (water, solar fluid, or air). Then solar heat can be used for heating water, to back up heating systems or for heating swimming pools.
