Efficient tankless water heaters Reliable , compact and built for performance The ENERGY STAR rated NRC98, Noritz's brand new ultra-high efficient condensing model, demonstrates its ongoing commitment to the green movement by expanding its newest tankless water heater product line: the ecoTough Series of high efficiency, easy-to-install, gas-fired condensing tankless water heaters. Features: High Efficiency Condensing Model BTU input range from 16,000 up to 180,000 BTUh Heat exchanger manufactured with commercial grade copper, 25% thicker piping than standard models Maximum flow rate capacity of up to 9.8 GPM Specifications: Width: 18-5/16" Height: 24-3/16" Depth: 9-3/8" Product Weight: 57 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