The EXR water heater offers tankless advantages in a conventional tank water heater. The product installs like any other water heater, while delivering tankless-type performance. Water in the 55-gallon tank stays put, never entering the household system and does not require any anodes, so scale buildup is minimized. App-based wifi connectivity lets users control settings remotely, while the on-board battery backup system keeps the water flowing hot even in case of a power interruption.