The Control-R Wireless Module  is for Demand Recirculation and accompanying smartphone app for consumer and dealer use.

The wireless module quickly connects via a two-wire interface and can be purchased with a new Rinnai tankless water heater or installed on existing Rinnai models manufactured since 2006. Once connected, the module pairs with the free Rinnai mobile app using a local Wi-Fi network. Homeowners can enable maintenance alerts and communications with a Rinnai independent dealer easily, right from the app. Additionally, users can control their tankless water heater from a smartphone or tablet to turn the system on and off, change the water temperature, monitor status and, on select models, activate the recirculation system,

Manufacturer Name: Rinnai America Corp.