The NCC1991 condensing tankless water heater from Noritz America delivers a thermal efficiency of 94 percent, with an input range of 16,000 to 199,900 Btu. This enables the unit to meet the hot water needs of larger residential applications, as well as a wide variety of commercial projects.
Using a special Quick Connect cable, two units can be coupled to provide an input of nearly 400,000 Btu, with a turndown ratio of more than 36 to 1. This makes the NCC1991 ideal for applications where hot water demand can vary substantially over the course of a day or throughout the year. In addition, the wall-hung heater requires less than three feet of wall space and. The unit can be mounted inside or outside on a wall or on a free-standing rack.