... alloy.. Frame: gavanize steel. header tube:seamless copper TU1,Ø22×0.9mm .Outer manifold: aluminium alloy, 1.8mm thickness.Frame: gavanize steel ... .Vacuum tube:Ø58×1800mm,Tri-elements .heater pipe: Ø14-6-0.6mm,inside of Vacuum tube .Accessories:water auto feeding tank ... tubes .Daily output: 150/200/250/300L .Max.working pressure:0.001 bar/10bar .Max.working temperature: 290°C .Working Principle ...