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 Eco TOUGH Series of high efficiency, easy-to-install, gas-fired condensing tankless water heaters. Offering a maximum input of 180,000 BTU per hour, the NRC98 Tankless Water Heater is designed to fully meet the domestic hot water needs of northern residences with two bathrooms and southern homes with three baths. Note: No vent pipe needed, Recommend Pipe Cover Kit PC3S. Features: Fuel Type: Propane. Condensing. Energy Factor: 0.92. Thermal Efficiency: 96 PER.. Capacity Range: 0.5-9.8 Gal./min. Gas Consumption: Min. 16,000 btuh - Max. 180,000 btuh. Temperature Settings: 100-140 DEG. F (in 5 DEG. F Intervals) (9 Options). Use IKWV2001THLF Isolator Kit with this Heater (Not Included). Home Size: Southern climate: 3 baths - Northern climate: 2 baths. Specifications: Overall Dimensions: 18.3" (W) x 9.4" (D) x 24.2" (H).