NAVIEN NHW700-120SE-NG

The figure of 137 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 medium draw pattern. That pattern describes a typical three- or four-person household on a busy morning. The fuel is natural gas, and the underlying data come from DOE CCD, retrieved 2026-09-19. The figure holds only for this draw pattern; a home that uses more or less hot water than the test assumes will not match it. The steps of the calculation are set out in how the annual cost is calculated.

Among the 80 models registered as a gas tankless unit at the medium draw pattern, this unit has the 52nd lowest energy use of 80. That puts it in the second-highest quarter of its class for energy use, at 2 therms above the class median of 135 therms. The page suits a reader who wants to confirm that a listing matches the registry at the medium draw pattern. It does not answer for a household whose hot-water use differs from that pattern, because the figure was not computed for it. The registry also lists a maximum flow rate in gallons per minute of 3. This page has no data on how that limit fits the fixtures in a particular home. For filtering by fuel, space and size, use the selector by fuel, space and size.

Running cost is not given in this text because it depends on the state average residential gas price, which differs by reader. The annual energy of 137 therms at the medium draw pattern is the quantity that price is applied to. The cost calculator on your own ZIP does that step with your state's price. A modeled installed-cost range appears in its own block with its source and date; it is a range, not a quote. To compare NHW700-120SE-NG with another unit, find a same-class replacement by model number. The comparison holds only when both units are read at the same draw pattern.