A tank system (1) for cooling, storing and withdrawing a liquid is proposed, comprising a tank (2) for cooling the liquid and storing the liquid in a volume (V) along a stratification axis (L) of the volume (V) for a thermal Stratification along the stratification axis (L), the tank (2) being fillable by a filling device (4) with a filling inlet (5) in an inlet area along the stratification axis (L) and via an outlet in an opposite to the inlet area along the stratification axis (L) Outlet area can be emptied. For flexible handling, to prevent mixing, the supplied liquid is directed into a flow which runs completely or partially in a plane perpendicular to the layering axis (L) and supplied to the liquid stored in the tank (2) so that the flow is tangential to an arc of a circle, which runs in a plane perpendicular to the layering axis (L).
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