heat pipe pressurized solar water heater, compact, pressurized, low price with high quality... non pressure solar water heaterstainless steel solar ... goodsSpecifications:1) Thickness of bracket: 1.5mm2) Heat-pipe vacuum tube: 58 mm x 1.8m x ... 2.5mm8) Tank diameter: 460mm9) Pressure: 0Pa10) Heat preservation: 72hrs11) Hail resistance: 25mm pressurized solar water heater, heat pipe solar water heater