Lennox WHGS050T40NANE****

This site computed the 256 therms figure; the registry does not list it. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the daily hot-water draw that the DOE test sets for the high draw pattern. This unit's UEF is 0.66, from DOE CCD data retrieved 2026-09-19. At that draw, the unit ranks 192nd lowest energy use of 414. That puts it in the second-lowest quarter of its class for energy use. The 4 therms gap to the class median holds only under those same test conditions. The figure does not describe a household whose daily hot-water use differs from the test draw. The steps behind it are set out in how the annual energy and cost are calculated.

The high draw pattern stands for a larger household, or one where showers and laundry overlap. This model's first hour rating, the gallons of hot water available in the first hour from a full tank, is 86 gallons. Its rated volume is 47 gallons. If you are a plumber or seller checking a listing, match these two values and the 0.66 UEF against the registry. The 256 therms figure belongs to the high draw pattern only. It should not be compared with figures for units tested at a different draw pattern. To compare it with models tested under the same conditions, use the same-class replacement finder by model number.

The text does not state a running cost. The cost of 256 therms of natural gas a year depends on your state's average residential gas price. The page therefore computes it from your ZIP in the cost calculator for your own ZIP. The 4 therms gap to the 260 therms median is this model's full difference in yearly gas use from the class median, at the test draw. This page does not have this unit's energy use at a lighter draw than the high pattern. The installed price is shown in its own block with its source and date. It is a modeled range, not a quote.