... *Length47*1500,58*1800mmTypeHeat pipe.Absorption rateMore than 92%Tank capacity(L)100,120,150,180,200,240,250,280,300Tube ... quantity10-30 tubes.Outer tank diameter420mm,460mm,470mm,480mmInner tank materialSUS304-2B ... food grade steel, anti-corrosion 1) inner tank : imported SUS-204 stainless steel 2)outer water tank: stainless steel , colored steel, galvanized ...