Abstract: Water distillation apparatus including separable evaporator storage reservoir and condensing modules coupled to each other in vertical succession. A fluid coil is suspended within the condensing module and is coupled to feed water from a source such as a domestic tap to the evaporator module. A vapor column including a spiral baffle extends through the storage reservoir module to direct steam generated in the evaporator module to the vicinity of the fluid coil, such that the coil affects heat exchange between inlet water and the surrounding steam to preheat the water prior to entry into the evaporator module and to condense the steam for flow by gravity into the storage reservoir module.

Abstract: An automatic water distiller has an insulated evaporator to which water is supplied after being preheated by cooling the steam, which is produced by the evaporator, in a condensing chamber with which the water is in heat exchange relation. Air also flows in heat exchange relation with the condensing chamber to aid in condensing the steam. A storage chamber is disposed above the evaporator and beneath the condensing chamber to receive the condensed steam and the air, which flows over the condensing chamber to cool the steam therein, is first passed in heat exchange relation with the distilled water in the storage chamber. The vapors in the condensing chamber are vented to the chamber in which the water is in heat exchange relation with the condensing chamber.