A. O. SMITH GCRL-30R 4**

The annual figure is computed by this site, not by the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, of 0.6 with the daily hot-water draw that the DOE test applies to the medium draw pattern. The result is 185 therms of natural gas a year, and it holds only under that condition. The source is DOE CCD, retrieved 2026-09-19. Among the 288 models registered as a gas tank at this draw pattern, the class median is 185 therms, and this model differs from it by 0 therms. It ranks 89th lowest in energy use of 288, in the quarter of the class that follows the lowest-energy quarter. The calculation is described in the methodology for water heater costs.

The first hour rating, the gallons of hot water available in the first hour from a full tank, is 55 gallons for this model. The rated volume is 29 gallons. The medium draw pattern stands for a typical household of several people on a busy morning, so the 185 therms figure applies to a household that uses hot water at that level. It does not describe households whose hot-water use differs, and this page has no annual energy figure for any other draw pattern. It also does not say whether a tank of 29 gallons meets a particular household's needs. To compare units by fuel, space and size, use the water heater selector.

The running cost is not stated here because it depends on the state average residential gas price, which differs by reader. Multiplying 185 therms by your own rate gives the yearly cost at the medium draw pattern. The cost calculator does this from your ZIP code. No installed price range is published for this model. Its ratings lie outside the range the cost database's model was fitted on, and the range is not stretched past it. To look for a same-class replacement, search by model number starting from GCRL-30R 4**. The rank of 89th of 288 and the difference of 0 therms from the median describe energy use only, not cost.