With an Energy Factor of 2.3, the GeoSpring heat-pump water heater exceeds current Energy Star requirements and consumes 62% less energy than standard electric water heaters, the maker says. The unit features a backlit LCD display that allows homeowners to choose from four different modes to adjust to changing hot water needs. A vacation setting drops the systems temperature set point to 50 degrees F to save energy, while also preventing the water from freezing. 800.626.2005.