The Eemax AutoBooster allows homeowners to increase the amount of hot water available for a shower by installing the AutoBooster on their new or existing hot water heater. AutoBooster installs directly to the outlet of a tank, and adds up to 45 percent capacity to water heater tanks, increasing the amount of available hot water. AutoBooster increases the hot water delivered by a 50-gallon tank to that of an 80-gallon tank, without taking up more space while costing less to operate than a traditional 80-gallon water heater. Vacation mode feature allows homeowners to switch off power to their tank when they're away, saving money on hot water heating when it isn't needed. Installation is a simple, one trade process and the unit has a compact design so that it can install on a tank, or be wall-mounted nearby.