Abstract: In the apparatus for distilling molten baths, substantially comprising a two-part vacuum tank (2), a melting crucible (5) disposed in the bottom housing part (3) of the vacuum tank and surrounded by a heating coil (4), a hat-shaped metal vapor condenser (8) held in the top housing part (6) of the vacuum tank (2), and a draining channel (10) disposed between the melting crucible (5) and the metal vapor condenser (8), a filter element (16) penetrated by a metal vapor thermometer (19) plus probe (20) is provided above the metal vapor condenser (8) in an opening (15) of the top housing part (6), wherein both the filter pot (17) surrounding the filter element (16), as well as the space (22) behind the coil, as well as the top housing part (6) are connected by separate individual vacuum lines (18, 23, 25) to a vacuum source (7).