Solar water heater Features 1) tank: Inner tankfv sus304 food grade stainless steel, thickness 0.4mm Isolation layer fv high dense polyurethane integral foam, thickness 55mm Outter shell fv zinc and aluminum coated steel sheet 2) supporting frame: Stainless steel plate with thickness of 1.2mm 3) vacuum tubes: Hard borosilicate glass tube, 30mm hailstone resistant Diameter: 58mm Length: 1, 800mm 4) echo tilt: 38, 45, 50 degree 5) system pressurized runs without pressure 6) water temperature up to 95 degree c Capacity: 1) high capacity model: 18 tubes / 252 l 20 tubes / 280 l 2) high temperature model: 20 tubes / 180 l 24 tubes / 216 l 26 tubes / 234 l 30 tubes / 270 l