... manufacturer,perfect quality. 3. Offer OEM/ODM 4. MOQ:No limited. Vacuum Tube Solar Heaters,Solar Panels Advantages:Non-pressure Vacuum Tube solar collector is connected with ... 2. Capacity: 100L,150L,200L,250L,300L,400L,500L.3. Material of inner tank : food grade SUS 304 or ... layer: High-density polyurethane foaming 6. Solar collector tube: borosilicate glass 3.3 7. Thickness of glass tube: 1.6 -2.0 mm ...