Compatibility: Works with Rinnai Tankless Water Heaters from 2006 onwards (except RH180 Hybrid models) App Notification: Lime Condition (LC) alert won't show for VA, VB, KA, and V53e series (pre-2009) Mounting Options: Magnetic enclosure for indoor water heater sides or wall mount with provided hardware Connection: Pairs with a single Rinnai Tankless Water Heater Included Items: Control-R Wi-Fi Module (5 ft wire), wall mounting hardware (2 anchors, 2 screws), and installation manual Rinnai Control-R Kit featuring Push-Button and Temperature Sensor, halting recirculation once set temperature is met. Compatible solely with Rinnai Tankless Water Heaters equipped with Rinnai Circ-Logic.