CopperPro: Copper heating element for efficient and silent heating. Whirl Flow Technology: For faster heating and maximum energy saving. Magnesium Anode Advantage: Heavy duty magnesium anode rod to prevent rust or corrosion and maintain life of element even in hard water Vitreous Enamel, Powder Coating: Protects inner tank for longer life. Single Weld Line Tank: Best in class inner tank to with stand high pressure up to 8 bar