AMERICAN G6N-UT4040NVR 5**

The figure of 264 therms is computed by this site, not published by the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, of 0.64 with the daily hot-water draw the DOE test assigns to the high draw pattern. The source is the DOE CCD, retrieved 2026-09-19. Within its class, the unit ranks 236th lowest energy use of 414, which places it in the second-highest quarter for energy use. The class median is 260 therms, and this model sits 4 therms above it. The registry data used here does not show what causes that difference. The methodology page explains how the annual cost is calculated.

The 264 therms figure applies only at the high draw pattern, which describes a larger household, or one where showers and laundry overlap. The first hour rating, the gallons of hot water available in the first hour from a full tank, is 83 gallons, from a rated volume of 38 gallons. These two values are the capacity the registry lists. They do not measure any particular household's demand. If a household's real draw differs from the federal test's daily draw, its actual use will differ from 264 therms. This page has no figure for this model at other draw patterns, so that value is not available. Readers weighing a different size can use the water heater selector by fuel, space and size.

The running cost is not written in this text, because it depends on your state's average residential gas price. The cost calculator on your own ZIP applies that price to the 264 therms of natural gas. At any single gas price, the 4 therms gap to the class median of 260 therms adds cost in direct proportion to the therms. The modeled installed-cost range appears in its own block on the page, with its source and date. It is a modeled range, not a quote, and it is not repeated here. To look at other units in the same class of 414 gas tank models at the high draw pattern, you can find a same-class replacement by model number using G6N-UT4040NVR 5**.