... Pressurized Solar Water HeaterProduct Specification Vacuum Tube:58 x 1800mm high borosilicate glass, three-layer deposition vacuum tube with copper pipe ... (Liters): 100, 150, 200, 250, 300, 400, 500Insulation Layer: high density polyurethane foam, thickness:50mm-60mmWith bracket: For balcony useFor more information, please ...