Lennox WHGS050S40*PXS****

The 245 therms figure comes from this site, not from the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the DOE test's daily hot-water draw for the high draw pattern. For this model the UEF is 0.69. The figure holds only at that test draw. A home that draws a different amount of hot water each day will use a different amount of gas, and the data does not give that amount. The source is DOE CCD, retrieved 2026-09-19. Among the 414 gas tank models at the high draw pattern, this unit sits in the second-lowest quarter of its class for energy use. The page on how the annual cost is calculated sets out each step from UEF to yearly energy.

The high draw pattern stands for a larger household, or one where showers and laundry overlap. This tank has a rated volume of 48 gallons. It also has a first hour rating, the gallons of hot water available in the first hour from a full tank, of 80 gallons. A household whose busiest hour needs more than 80 gallons is outside what that rating covers. The registry data does not show how the tank performs there. A smaller household would draw less than the test assumes, so its gas use would not match 245 therms. The data does not state that lower figure. To compare other sizes or fuels against this 0.69 UEF, use the selector by fuel, space and size.

The running cost is not written here because it depends on your state's average residential gas price. The page computes it from your ZIP, using the 245 therms yearly figure at the high draw pattern. The gap to the class median, given above, is a gap in energy. What it is worth in money also depends on your rate. The installed price range appears in its own block, with its source and date. It is a modeled range, not a quote. To run the 245 therms figure on a different ZIP, open the cost calculator on your own ZIP. To look up another gas tank unit at the high draw pattern, use find a same-class replacement by model number.