Offering a maximum input of 180,000 Btu per hour, the NRC98 Tankless Water Heater from Noritz is designed to fully meet the domestic hot water needs of northern residences with two bathrooms and southern homes with three baths. The NRC98 has an Energy Factor of approximately 0.93, or nearly 10 points higher than that of a comparable, conventional tankless model and over 30 points more than the EF for a standard gas-fired storage water heater.