A tank containing a water separator composed of bundles of laminations for drying wet vapor, and a superheater for subsequent superheating of the dried vapor. The water separator is coaxially disposed ahead of the superheater in the horizontal-cylindrical tank, which has at least one vapor inlet and one vapor outlet. The superheater includes tube bundles which are uniformly disposed about the central axis of the tank, and can vary in number and type of construction. In the direction of the central axis of the tank, the water separator has the shape of a truncated pyramid or cone. The vapor discharge surfaces of the bundles of laminations, within the water separator, are disposed symmetrically, vertically, and in tiers relative to the central axis of the tank, and are disposed at an angle of between 10.degree. and 170.degree. thereto.