The Rheem Performance Line. Exclusive to the Home Depot! This water heater provides instant and continuous hot water for up to 2 showers. Tankless Electric Water Heaters help reduce energy usage, save on energy costs, and are small so they will be a perfect match for installations under a cabinet or sink in your home, office, boat or RV. Plus, it's a great value with a 5-year heat exchanger and 1-year parts limited warranty. Incoming water temperatures, hot water demand and size of the tankless unit installed are all factors in meeting your hot water needs. If your requirements exceed 2 showers, it's recommended that you consider a Rheem natural gas or propane tankless unit. Requires 4 x 40 AMP double pole breakers with 8 gauge wire (professional installation required).