A.O. Smith ENT-50 ProMax High Efficiency Tall Electric Water Heater, 50 gal Permaglas glass coating protects steel tank from corrosion and maximizes tank life; Dynaclean diffuser dip tube helps reduce lime and sediment buildup while maximizing hot water output; made from long-lasting PEX cross-linked polymer CoreGard anode rode aluminum anode with stainless steel core protects tank against corrosion longer than ordinary steel anodes Durable, tamper-resistant brass drain valve,Product Dimension is 60 1/4 inch height Meets all current regulations set forth by the National Appliance Energy Conservation Act (NAECA)