** Open Box **Rheem instantaneous water heaters provide on demand, continuous hot water to your home. At 99.8% energy efficient, this series of tankless water heater is more efficient than your standard electric tank-based hot water heater. Instantaneous water heaters can be used as single point-of-use or for multiple applications at a time.Features Flow rate up to 3.17 Gallons Per Minute (GPM) Copper immersion heating elements with brass top to increase durability Threaded heating elements for easy replacement if necessary 5 Year Parts WarrantyAverage Application Use Examples Kitchen Faucet: 2-3 GPM Shower: 1.5-3 GPM Dishwasher: 2-4 GPM Washing Machine: 3-5 GPM