Ruud PRO+G55-45U RH59 EC1*

This site computed the 273 therms figure. The registry does not list it. The calculation combines the model'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. The registry lists a UEF of 0.62 for this model. The data comes from the DOE Compliance Certification Database and was retrieved on 2026-09-19. The result shows gas use at the test's draw, not at any particular household's draw. Actual use in a home depends on how much hot water that home uses, and this figure does not measure that. The steps are set out in how the annual cost is calculated, so a plumber or seller can check the method against the registry entry.

The high draw pattern represents a larger household, or one where showers and laundry overlap. For that use, the registry lists a first hour rating, the gallons of hot water available in the first hour from a full tank, of 99 gallons. The rated volume is 55 gallons. Among the 414 gas tank models registered at this draw pattern, this one is in the highest quarter for energy use. Its gas use at a lighter daily draw is not available in the registry data. A smaller household is therefore outside what this figure describes. If you want to compare it with models in the same class, you can find a same-class replacement by model number.

This text gives no running cost, because the cost depends on your state's average residential gas price. The cost calculator on your own ZIP applies that price to the 273 therms figure. The same price also applies to the gap from the class median. At the high draw pattern, this model uses 13 therms a year more than the 260 therms median. What that gap costs therefore changes from state to state, and this page does not estimate it. The installed price appears in its own block on this page as a modeled range, not a quote. It is kept separate from the energy figure and its source.