The patented SmartPlug ® Instant Hot Water Control lets you upgrade any existing hot water recirculation pump with a power cord to “Smart” operation. Simply connect the SmartPlug ® Instant Hot Water Control to any 110V power outlet then plug the Circulator power cord into the SmartPlug. Using a sensor that mounts to the hot water supply pipe, the SmartPlug ® will record the daily hot water usage pattern in a home and adjust the Circulator run time automatically. Hot water will always be available when needed. No Programming, Timers or Aquastats Required • Sensor Included • U.S. Patent #8,594,853 and #9,207,682