Tankless Water Heater, Sub Brand: Professional Classic, Residential Electric, Indoor, 0.3 to 4.4 gpm Flow Rate, 80 to 140 Deg F Operating Temp., 0.3 gpm Activation, 99.8% Energy Efficiency, 0.99 Energy Factor, Minutes of Hot Water in Shower: Infinite, Back To Back Showers: Infinite, Water Connection: 3/4 inch NPT Water Connection, Power Supply: 240V Voltage, (2 x) 8 AWG Wire Gauge, 75 A Amperage, (2 x) 40A Breaker Size, Elements: 2 Elements Copper Clad Immersion Heating Element(s) with Brass Terminations for Increased Durability, Max 18 kW (9 kW each), Wall Mount, Dimensions: 18-1/4 inch H x 14-1/2 inch W x 3-1/2 inch D, Warranty: 5 Year Limited Warranty, Rated Pressure: 25 PSI min., 150 PSI max., Std. Temp. Settings: 120°F (Adjustable 80°F-140°F), Temp. Accuracy: +/–1° increments at steady flow, Turn-On: 0.3 GPM, Standards: WQA certified lead free, ETL Listed to UL 499 and CSA C22.2 No.64.