The NRC1111 199,900 BTU Condensing Propane Tankless Water Heater has a maximum of 11.1 GPM. The direct vent system allows 3 in. or 4 in. PVC or CPVC to be installed. This residential water heater heats water up to 140° and meets federal and state air quality standards which are below 20 PPM. Features: 11.1 GPM tankless water heater provides enough hot water to run from 3 to 4 hot water appliances at 1 time Tankless gas water heater costs less to operate than electric models ENERGY STAR qualified tankless water heater is highly efficient and uses up to 40% less energy than storage water heater models 12 year warranty on the heat exchanger, 5 parts, plus all Noritz models feature a 1-year in-home warranty Specifications: Width: 18-5/16" Height: 24-3/16" Depth: 9-3/8" Product Weight: 74 Fuel Type: Gas Gas Type: Liquid Propane Gas Connection: 3/4" Water Connection: 3/4" Water Pressure (Min): 15 psi Water Pressure (Max): 150 psi Temperature (Min): 100° F Temperature (Max): 140° F Voltage: 120V Frequency: 60 Amperage: 1.775