Abstract: Apparatus for reducing the temperature of tap water enroute to the ice making section of a commercial ice cube maker. Precooling is accomplished by coiled tubing immersed in residual ice water recovered from the interior of the storage bin by a reservoir mounted beneath the drain of the storage bin of the commercial ice cube maker. Additional cooling of held water is accomplished by coiled tubing inserted in the flow line and located on the floor of the storage bin beneath the stored ice cubes. In both cases, the cooling energy which would otherwise be wasted is utilized to remove BTU's of heat from the tap water prior to injection of the tap water into the ice cube making section of the commercial ice cube maker. Requiring no additional energy to operate, the apparatus dramatically increases the production and efficiency of the commercial ice cube maker, especially in warmer climates.