The Rinnai fireplace app controls features of new Rinnai fireplace models. This is not a standard feature fitted to all models. The Rinnai fireplace app will enable you to set a temperature and the fireplace will then bring the room temperate to the set level, and maintain that temperature. It will enable you to switch between set temperature to manual flame height control mode. In this mode you can manually adjust the flame height up or down. It enables automatic timers to be easily set and changed for each day of the week. You can register multiple devices to control the fireplace and then you can have fireplace controller wars with your children or spouse. You will wonder how you ever lived without it.