Ruud PROG40S-40N RH62

This site calculates the 191 therms figure; it does not come 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 medium draw pattern. This unit's UEF is 0.58. The registry values come from the DOE CCD, retrieved 2026-09-19. The figure assumes the test's daily draw, so a household that uses more or less hot water will have a different yearly total. This page does not know your actual hot-water use, so that difference is not available here. The steps that turn this figure into a yearly cost are set out in how the annual cost is calculated.

This tank has a rated volume of 39 gallons. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 66 gallons. The registry lists this model under the medium draw pattern, which models a typical household's daily use. This unit ranks 231st lowest in energy use among the 288 gas tank models at that pattern. That puts it in the highest quarter of its class for energy use. If you are checking whether this unit uses little gas for its class, note the 6 therms gap above the median. To check other units in the same class, you can find a same-class replacement by model number.

The 191 therms at the test draw is the same in every state, but the price of that gas is not. The page calculates running cost from your state's average residential gas price, based on your ZIP. For that reason, this text states no cost figure. To see the running cost at your own rate, enter your ZIP in the cost calculator for your own ZIP. The cost of the 6 therms gap to the class median also depends on that state price, and this text does not state it. The installed-cost range in its own block on this page is a modeled range, not a quote. That block gives its own source and date.