6-Year Limited Tank Warranty, 6-Year Parts Warranty, 1-Year Labor Warranty. Stainless Steel Lower Heating Element - Stainless steel sheathed, screw-in, direct immersion, 4500-watt, 240-volt heating elements for maximum efficiency and longer life. Blue Diamond® Glass Coating-Provides superior corrosion resistance compared to industry standard glass lining. Eco-friendly non-CFC foam insulation, heat traps and other features combine to yield a higher Energy Factor that maximizes savings on operating costs. Coreguard™ anode rods with a stainless steel core that extends the life of the anode rod allowing superior tank protection far longer than standard anode rods. Enhanced-Flow Brass Drain Valve-Our standard residential water heaters have a solid brass, tamper resistant, enhanced-flow, ball type, drain valve. Models ship with supplied insulation blanket Approved for Manufactured Housing - All residential electric water heaters are compliant with HUD Standards for mobile home/ manufactured housing. CSA Certified and ASME Rated T&P Relief Valve.