Abstract: A water purification apparatus positionable on an existing dispenser has a valve control member positionable in the water plenum of the dispenser to control release of purified water from the apparatus to the dispenser. A feedwater tank receives supply water which is fed to a water level control tank to maintain the water level in the boiler of the apparatus above the heating element. The control tank includes a partition separating a main reservoir from a de-foamer control chamber within which anti-foaming agent may be added. A condenser is coiled into a number of convolutions about a central opening and has external heat exchanger fins. An end cap assembly closes the central opening except for a small portion through which air is blown by a fan so that substantially all of the air flows over the fins. The boiler is a cylindrical container having a peripheral lip about an open end on which a lid having a steam outlet tube is positioned.

Abstract: A water purification device mounted within a housing adapted to be positioned on an existing water cooler/dispenser has a valve control member extending from the base of the housing and is positionable within the water reservoir of the dispenser to control the release of purified water from the device to the reservoir. The device includes a feedwater tank into which supply water is fed and which feeds water to a water level control tank which communicates with the bottom of a boiler which is maintained at the same level as the water in the control tank. The control tank includes a control valve which maintains the water in it to a predetermined level above the level of the heating element in the boiler. The boiler is connected to condenser coils for condensing vaporized water from the boiler to form distilled water which is directed through a carbon filter to a distillate storage tank where the purified water is stored until required by the water cooler/dispenser.

Abstract: A water purification device mounted within a housing adapted to be positioned on an existing water cooler/dispenser has a valve control member extending from the base of the housing and is positionable within the water reservoir of the dispenser to control the release of purified water from the device to the reservoir. The device includes a feedwater tank into which supply water is fed, either automatically, or manually. The feedwater tank, when the water is above a minimal level, feeds water to an anti-backflow control housing which communicates the water from the feedwater tank to the bottom of a boiler which is maintained at the same level as the water in the feedwater tank without the use of a float within the boiler. The anti-backflow housing includes a check valve in the form of a ball that prevents the backflow of heated water from the boiler into the feedwater tank.