Lennox WHGS050S40NANE****

The registry does not list the 260 therms figure itself. This site computed it from the registry's UEF, the ratio of hot water delivered to energy used. For this model the UEF is 0.65. We combined that ratio with the DOE test's daily hot-water draw for the high draw pattern. The data comes from the DOE CCD, retrieved 2026-09-19. The class for comparison is the 414 models registered as a gas tank at the high draw pattern. This model ranks 204th lowest in energy use among those 414. That puts it in the second-lowest quarter of its class, at the median noted in the summary above. The steps behind the annual energy and cost figures are listed on the methodology page.

The high draw pattern stands for a larger household, or one where showers and laundry overlap. The 260 therms figure holds only for that level of use. This model lists a first hour rating, the gallons of hot water available in the first hour from a full tank, of 78 gallons. Its rated volume is 48 gallons. A home whose daily use matches the high pattern can read 260 therms as the tested reference for its own use. For a home that uses less or more hot water, the data gives no energy figure. That amount is not available here. To check other fuels, spaces or tank sizes, use the water heater selector by fuel, space and size.

The text on this page does not state a running cost. The cost of 260 therms of natural gas depends on your state's average residential gas price. The page computes that cost from your ZIP rather than from a national figure. You can see it with the running-cost calculator for your own ZIP. The installed-cost range appears in its own block, with its source and date. It is a modeled range, not a quote, and this text does not restate it. Neither the running cost nor the installed range changes the rank of 204th of 414. Energy use at draws other than the federal test's high pattern is unknown from this data.