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Noritz America’s NCC1991 condensing tankless water heater delivers a thermal efficiency of 94% with an input range of 16,000 to 199,900 Btu, ideal for larger residential applications and a wide variety of commercial projects. Using a Quick Connect cable, two NCC199-DV units can be coupled to provide an input of nearly 400,000 Btu with a turndown ratio of 36 to 1. To obtain its 94% efficiency level, the NCC1991 uses a secondary heat exchanger made entirely of stainless steel, transferring heat from the exhaust gases to the water.
