The device (200) has a pump (112) intended to propel hot water into a pipework (102) upstream of an introduction orifice (104). A water level (116) in a collecting device (108) is higher than a level of a discharge orifice (106) and a level of the introduction orifice, where the level of the introduction orifice is lower than a level of a top part of a coil (110). The pipework comprises a part taking the form of the coil in a descending spiral between the introduction orifice and the discharge orifice and an ascending portion (202) between the introduction orifice and the coil.