Solar water heater III Features: 1) tank: Inner tankfv sus304-2b 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: Galvanized steel, electrostatic powder coated 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 Capicity: 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