... thicknessinner tank diameter310mm, 360mmouter tankSUS 304-2B stainless steel, 0.30mm thicknessOuter tank diameter420mm, 460mm,470mmCapacity120L, 150L, 180L, 200L, ... hoursWeldingArgon arc weldingVacuum tube type3 target tube AL-N-AL/SS/CU coatedOuter Glass Tube Diameter58mmInner Glass Tube Diameter47mmLength of the ... quality silicone rubber polymer Stainless steel & glass tube solar water heater