10 year warranty - Lifetime warranty only if the user registers the water heater on line - Includes relief valve - Two 4500 watt 240 volt elements - Laser welded 316L stainless steel tank - Inlet and outlet on top of the tank have built in heat traps - 20 gallons per hour recovery at 90 degree temperature rise - 110 degrees minimum delivered temperature - 150 degrees maximum delivered temperature - 98% recovery efficiency