Noritz NRC83-DV-NG ecoTOUGH Natural Gas Condensing Water Heater, 8.3 Gallons Per Minute Max flow rate: 8.3 GPM Max BTU: 157000 0.92 energy factor 2-pipe direct vent. PVC, CPVC or Polypropylene 3/4-Inch gas, hot and cold water connections