... : inner tankSUS 304-2B stainless steel, 0.41mm thicknessinner tank diameter310mm, 360mmouter tankSUS 304-2B stainless steel, 0.30mm ... thicknessOuter tank diameter420mm, 460mm,470mmCapacity120L, 150L, 180L, 200L, 240L,300LTank insulating ... diameterSealHigh quality silicone rubber polymer Stainless steel solar water heater with assitant tank