... hot water heaterComponents Solar thermal collector (vacuum tube with copper heat pipe)Pressurized water tank(includes P/T safety ... valve, heating element, magnesium bar, heat exchange copper coils)Working station (includes expansion vessel, circulation pump, digital ... 0.4mm thickness3. Material of heating preservation: 50-60mm Polyurethane.4. copper coils/tank: 0,1,25. water tank capacity: ...