Navien High Efficiency Condensing Tankless Water Heater, Series: NPE-2, 12000 to 180000 Btu/hr, 200 W, 5.1 gpm, 0.95 Energy Factor, 97 % Efficiency, 2 in, 3 in Vent, Forced Draft Direct Vent, 2 A, 120 V, 60 Hz, NPT Connection Type, 15 to 150 psi, Yes Energy Star Compliant, Wall Hung Mount, Natural Gas, Propane Gas, Electronic Ignition, Carbon Steel, Lead-Free/Contains Lead: Lead-Free, 35 to 140 deg F, 27.4 in H x 17.3 in W x 13.2 in D, 10100 ft Altitude