Leridian Dynamics, Inc.'s flow meter based, "on demand" hot water recirculation pump controller has a timer function, is fully configurable with a smart phone app (Android and iPhone) and will operate on both 110VAC and 220VAC. 
On demand recirculation pump for hot water recirculation system. Provides on demand hot water throughout your house without the need to install buttons and run wires. The on demand pump controller is contained within the utility closet and works from any plumbing fixture. Control the settings of the Recirculation Control via a smart phone app.