Abstract: A method and an apparatus for providing a cooling or a condensing of a hot fluid received from a heat generating apparatus using a cooling apparatus or a condenser. The apparatus includes a hollow cooling or condensing pot (6) having an inner cavity (10) providing an axial through channel in the pot (6). There is at least one cooling sling (12) in the cavity and/or adjacent the walls or inside the walls (13) of the pot (6). The cooling or condensing pot (6) is formed for mounting on a hull lead-through (4) with one end thereof, or as a lead-through of a water craft. This lead-through exteriorly opens underneath the level of the surrounding sea water (3). The second end (2) of the cooling or condensing pot (6) is arranged for being connected to a tube or hose which is open upwardly, for instance a drainage hose (2) of a sink (1) or a similar device.