Material and major element of solar water heater: 1. Inner water tank: sus304-2b stainless steel /0.5mm thick 2. Outer water tank: white plate /0.4mm thick 3. Bracket: sus430 stainless steel /1.2mm and 1.5mm thick 4.Solar vacuum tube: A) size: 47 x 1, 500mm / 58 x 1, 800mm B) qty: 15 /18 / 20 / 24 / 30 pcs 5.Temperature insulation layer; 5.5cm imported polyurethane, keep same temperature and high pressure foam 6.Tank diameter:460 mm
