Rheem PRO+G40-38U RH67 PD*

The figure of 173 therms is not a meter reading. This site computed it from the registry's UEF, the ratio of hot water delivered to energy used, which is 0.64 for this model. The calculation also applies the DOE test's daily hot-water draw for the medium draw pattern. That pattern represents a typical household using hot water heavily on a busy morning. The source is the DOE CCD, retrieved 2026-09-19. The registry itself does not publish this annual figure. A household that draws more or less hot water than the test will see different gas use than 173 therms. Details on how the annual cost is calculated are on the methodology page.

Among the 288 gas tank models registered at the medium draw pattern, this one has the 44th lowest energy use. That puts it in the lowest quarter of its class. Its 173 therms sits 12 therms below the class median of 185 therms. The registry lists a first hour rating, the gallons of hot water available in the first hour from a full tank, of 67 gallons. The rated volume is 38 gallons. A household whose busiest hour needs more than 67 gallons of hot water is outside that rating. The selector by fuel, space and size can narrow other options.

The running cost of this model depends on your state's average residential gas price. This text states no cost figure, because the price varies by location. The cost calculator applies your own ZIP to the 173 therms shown here. That result holds only for natural gas at the medium draw pattern. The installed price range appears in its own block, with its source and date. That range is a modeled installed-cost range, not a quote. The 12 therms gap from the 185 therms class median is a difference under test conditions, and your own use may change it. To look at a same-class unit, find a replacement by model number.