The first step in making a great water heater even better is the installation of the Accessory Module. All of the accessory packages are powered and controlled by the Accessory Module (wall outlet required). The module incorporates a multi-color LED status indicator that monitors the Accessory Packages. This same display also offers diagnostic codes that signal leak detection, inlet shut-off valve status, and a control fault. The module also features an audible alarm that is activated if a leak is detected and is de-activated if a leak has been corrected. A mute feature is included to silence the alarm with the push of a button. This module is used in both light-duty and standard commercial gas water heaters.