Rheem PROG39S-38U RH62 EC1*

The registry does not print the annual figure. This site calculated it from the registry's UEF, the ratio of hot water delivered to energy used, and the DOE test's daily hot-water draw. This model's UEF is 0.59. The source is the DOE CCD, retrieved 2026-09-19. The medium draw pattern stands for a typical three- or four-person household. The figure applies only at that pattern's daily draw. This page gives no adjusted figure for a home that draws more or less hot water. For the steps behind the calculation, see how the annual cost is calculated.

The model ranks 186th for lowest energy use among the 288 models registered as a gas tank at the medium draw pattern. That places it in the second-highest quarter of the class for energy use. Its rated volume is 37 gallons. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 68 gallons. The ranking shows how this unit compares with other gas tank models at the same pattern. It does not compare the model with other fuels or heater types, because those are outside the class. It also does not describe a household whose daily use is far from the medium pattern. To check other models in this class, use the same-class replacement search by model number.

The running cost is not stated in this text. It depends on your state's average residential gas price, so the page calculates it from your ZIP code using the 188 therms figure. You can run the same calculation in the water heater cost calculator for your own ZIP. An installed price range is not published for this model. Its ratings lie outside the range the cost database's model was fitted on, and the page does not extend that range to cover them. The 3 therms gap to the class median is a difference in energy use. What that gap costs also depends on your gas price. To compare models by other criteria, see the water heater selector by fuel, space and size.