50 Gallon, Electric Heat Pump, Energy Star Qualified, Multiple Operating Modes,Glassed Lined, Vacation Mode Reduces Operating Cost & Provides Freeze Protection During Extended Absence, Long Lasting Backup Elements, Protective Anode Rod, Has A Control System To Ensure Tank Is Full To Avoid Dry Firing, Easy To Read Temperature Display, Easy Removal Of Air Filter For Routine Cleaning, Vacation Mode Maintains 60 Degrees Temperature Up To 99 Days, 2.78 Efficiency Mode, In Hybrid Mode, 2.75, Electric Mode .89, Efficiency, First Hour Rating Gallon 42.1 Efficiency Mode, 67.5 Hybrid Mode, 59.1 Electric Mode, 10 Year Limited Tank & Parts Warranty, Tank Dimensions 63"H x 22"D.