NAVIEN NHW700-160AI-NG

The figure of 209 therms is computed by this site, not by the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, of 0.81 with the DOE test's daily hot-water draw for the high draw pattern. The source is DOE CCD, retrieved 2026-09-19. The unit ranks 323rd lowest energy use of 397 models registered as a gas tankless unit at this draw pattern, so more than half of its class uses less gas at the same test draw. Read the figure as a test-condition value. A home whose hot-water use differs from the federal test's daily draw will use a different amount, and this page does not estimate that amount. The method behind the annual figure is documented separately.

The high draw pattern describes a larger household, or one where showers and laundry overlap. The unit's maximum flow rate in gallons per minute is 4. The registry data used here does not show whether that flow meets the demand of a particular home. The unit fits a reader who needs to confirm a gas tankless model listed for this draw pattern and accepts an energy figure 27 therms above the class median of 182 therms. It does not fit a reader whose priority is the lowest annual gas use in the class, because a rank of 323rd lowest of 397 places it in the highest quarter for energy use. To compare options, find a same-class replacement by model number and check each candidate at the same draw pattern.

The running cost is not stated here. It depends on the state average residential gas price, and 209 therms is a quantity of natural gas, not a price. Turning it into a cost needs the reader's own location, so the page computes the cost from a ZIP instead of assuming one. The cost calculator on your own ZIP does this for the high draw pattern. The modeled installed-cost range appears in its own block with its source and date, as a modeled range and not a quote. Measured gas use in an individual home is not available in this data. Only the test-condition figure, retrieved 2026-09-19, is available.