Lennox WHGS050T40NANS****

The 269 therms figure is not printed in the registry. This site calculated it from the registry's UEF, the ratio of hot water delivered to energy used. This model's UEF is 0.63. The calculation combines that ratio with the DOE test's daily hot-water draw for the high draw pattern. The UEF comes from DOE's Compliance Certification Database (CCD), retrieved 2026-09-19. The resulting figure applies only at that test draw, not to any particular home. The step from daily draw to yearly figure is set out in how the annual cost is calculated. The registry also lists a rated volume of 47 gallons for this tank.

The high draw pattern describes a larger household, or one where showers and laundry overlap. For that use, the registry gives a first hour rating, the gallons of hot water available in the first hour from a full tank, of 85 gallons. The 414 gas tank models at the high draw pattern are ranked by energy use. This unit ranks 320th lowest of 414, so most of its class uses less gas at the same test draw. Its gap to the class median is 9 therms a year. If you are matching like for like, you can find a same-class replacement by model number. Then compare each candidate's yearly figure with 269 therms.

The running cost is not stated in this text. It depends on your state's average residential natural gas price, so the page calculates it from your ZIP. You can enter it in the cost calculator on your own ZIP to price 269 therms at your rate. The installed price range is shown in its own block, with its source and date. It is a modeled range, not a quote. This page has no energy figure for this model at a lower draw pattern. If your household uses less hot water than the high pattern assumes, its actual gas use is not available here. As noted above, 269 therms holds only at the test draw.