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Tankless water heater is designed to offer 94 percent efficiency. The NCC1991 condensing water heater has an input range of 16,000 to 199,900 Btu. Two NCC199-DV units can be coupled to provide an input of nearly 400,000 Btu, with a turndown ratio of more than 36 to 1. Secondary heat exchanger transfers heat from the exhaust gases to the water.