Save energy and costs with this Rheem Performance Electric Tankless Water Heater. This compact heater can be installed under a cabinet or sink with no venting required. It uses a 3 x 49 amp double pole breaker to give you continuous, instant hot water when needed. This electric tankless water heater requires professional installation. It's covered by a five-year heat exchanger and one-year parts limited warranty.. Electric tankless water heater provides consistent hot water. Energy and cost savings of up to 34% in whole-home installations. Tankless water heater requires 3 x 40 amp double pole breakers. Amperage (A): 113 A. Application Type: Residential. First Hour of Delivery (gallons/hr): 316. Flow Rate @ 35°F Rise (gallons/min): 5.27 gal (US)/min. Flow Rate @ 45° Rise (gallons/min): 4.1 gal (US)/min. Indoor/Outdoor: Indoor. Maximum Flow Rate (gallons per minute): 5.27. Number of Showers: 1-2. Product Weight (lb.): 14 lb. Required Volt Connection: 240 volt. Uniform Energy Factor: 0. Water Heater Features: Wall Mounted. Water Heater Type: Electric. Wattage (watts): 27000 W. Certifications and Listings: CSA Listed,ETL Listed,UL Listed. Part Warranty: 1 Year. Kilowatt: 27. Product Depth (in.): 3.5 in. Product Height (in.): 18 in. Product Width (in.): 21.625 in. Water Connection Size (in.): 3/4 in NPT