Abstract: A water distiller includes an inner vessel in which source water is heated, an outer dome or housing on the inner surface of which the vapor from the inner vessel is condensed and a reservoir for receiving the condensate. The inner vessel includes a closure which directs vapor radially of the inner vessel to the dome or housing and which may include a vapor filtration element. A variety of domes or housings are shown including those of double wall construction with ports or vents to direct heat transfer fluid or air between the walls thereof, and those having lower portions which downwardly converge to direct the condensate to a central mouth of a reservoir.