A distillation unit (30, 30A), comprising: a heating chamber (32, 32A) having a first end and a second end (42, 42A) and a sidewall extending therebetween defining an interior (46, 46A) adapted to contain a non-potable liquid for distillation; a dome-shaped condensing portion (34, 34A) defining an apex (56,72) and having an inner surface (50, 50A) and an outer surface, the condensing portion (34, 34A) disposed over the first end of the heating chamber (32, 32A), wherein first end of the heating chamber (32, 32A) and the inner surface (50, 50A) of the condensing portion (34, 34A) are provided in fluid-transfer communication; a pre-heat jacket (36, 36A) having a first surface (60, 51A) and a second surface (62, 52A) and an interior defined therebetween adapted to receive non-potable liquid for distillation therein, the first surface (60, 51A) disposed adjacent the outer surface of the condensing portion (34, 34A), the preheat jacket (36, 36A) defining an access entry for introducing non-potable liquid for distillation into the interior (46, 46A) of the heating chamber (32, 32A) and a cylindrical tube disposed between the access entry located at the apex and the interior (46, 46A) of the heating chamber (32, 32A) adjacent the second end (42, 42A) where heat is applied, to direct the flow of non-potable liquid into the interior (46, 46A) of the heating chamber (32, 32A) such that non-potable liquid may pass through the interior of the preheat jacket (36, 36A) and through the access entry into the interior (46, 46A) of the heating chamber (32, 32A); and a trough (38, 38A) adjacent the first open end of the heating chamber (32, 32A) for receiving a potable liquid therein. a heating chamber (32, 32A) having a first end and a second end (42, 42A) and a sidewall extending therebetween defining an interior (46, 46A) adapted to contain a non-potable liquid for distillation; a dome-shaped condensing portion (34, 34A) defining an apex (56,72) and having an inner surface (50, 50A) and an outer surface, the condensing portion (34, 34A) disposed over the first end of the heating chamber (32, 32A), wherein first end of the heating chamber (32, 32A) and the inner surface (50, 50A) of the condensing portion (34, 34A) are provided in fluid-transfer communication; a pre-heat jacket (36, 36A) having a first surface (60, 51A) and a second surface (62, 52A) and an interior defined therebetween adapted to receive non-potable liquid for distillation therein, the first surface (60, 51A) disposed adjacent the outer surface of the condensing portion (34, 34A), the preheat jacket (36, 36A) defining an access entry for introducing non-potable liquid for distillation into the interior (46, 46A) of the heating chamber (32, 32A) and a cylindrical tube disposed between the access entry located at the apex and the interior (46, 46A) of the heating chamber (32, 32A) adjacent the second end (42, 42A) where heat is applied, to direct the flow of non-potable liquid into the interior (46, 46A) of the heating chamber (32, 32A) such that non-potable liquid may pass through the interior of the preheat jacket (36, 36A) and through the access entry into the interior (46, 46A) of the heating chamber (32, 32A); and a trough (38, 38A) adjacent the first open end of the heating chamber (32, 32A) for receiving a potable liquid therein.