Abstract: Disclosed is an apparatus for carbonating water or other beverage comprising a carbonating tank for charging the water with carbon dioxide and for dispensing the carbonated liquid. The apparatus also includes a reservoir tank disposed above the carbonating tank for storing the liquid to be carbonated. The two tanks communicate with each other through a valve which is controlled by a float disposed in the carbonating tank. The float valve is arranged to open and permit the liquid to flow from the reservoir tank into the carbonating tank when the latter is substantially empty and the pressure therein has been reduced by withdrawal of the carbonated liquid sufficiently to allow the liquid to flow into the carbonating tank by gravity.