2025-09-09 00:00:00 The official Rexnordic app allows you to interact with your Airrex heater by push of a button. The Rexnordic app allows you to connect to your heater and to operate its functions remotely. The Rexnordic app is optimized for smartphones supporting Android 5.1 or higher and requires Bluetooth v. 4.2 or higher.