50 Gallon, Hybrid Electric Water Heater, Advanced Heat Pump Technology With Traditional Electric Elements, Easy Replacement Of Standard Electric, Can Also Retro Fit A Natural Gas Unit, Two 4500W, 240V Elements, Additional Compressor & Evaporator Pulls Ambient Heat From Surrounding Air, Coils Wrap The Tank & Transfer The Additional Heat To The Water, Can Reduce Operating Costs By As Much As 62% Over A Standard Electric Water Heater, Multiple Electronic Modes Can Be Set On Front Panel, Energy Star, Includes A 10 Year Limited Parts Warranty & 1 Year Limited Labor Warranty.