AMERICAN STANDARD WATER HEATERS PV40SLN*

The 173 therms figure is calculated by this site. The registry does not publish it. 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 medium pattern. For this model the UEF is 0.64, taken from the DOE CCD as retrieved on 2026-09-19. The result applies only at the federal test's daily draw. A household that draws more or less hot water will use a different amount of gas. The exact steps are set out in how the annual energy and cost are calculated. The registry does not give actual gas use at your address under your own daily draw.

Among the 288 gas tank models at the medium draw pattern, the PV40SLN* ranks 44th for lowest energy use. Its 173 therms is 12 therms below the class median of 185 therms. The medium pattern represents a typical household of several people with a busy morning. The model's rated volume is 39 gallons. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 71 gallons. The annual figure matches a household whose morning use stays within that first hour rating. To check other units in the same class, you can find a same-class replacement by model number.

The annual figure fits less well for a household that draws more than 71 gallons in its busiest hour. The 173 therms figure assumes the medium pattern's daily draw, so it does not describe that household's use. Figures for this model at other draw patterns are not available here. This text does not give a running cost, because the cost depends on your state's average residential gas price. The page calculates it from your ZIP, and you can recalculate it in the cost calculator for your own ZIP. The installed-cost range in its own block on this page is a modeled range with its source and date. It is not a quote.