A.O. Smith PXNS-50 Conservationist Short Electric Water Heater, 50 gal Blue Diamond glass coating provides superior corrosion resistance compared to industry-standard glass lining Dynaclean II, a specially designed dip tube directs incoming cold water to create turbulence in the tank, which reduces lime and sediment buildup Phoenix low-watt density Incoloy steel upper and lower heating elements are designed to operate more efficiently and last longer than standard copper CoreGard anode rod, magnesium anode with stainless steel core protects tank against corrosion longer than ordinary steel anodes Durable, tamper-resistant T&P relief valve