A. O. SMITH GCR-50 4**

The figure of 273 therms is not a measurement taken in your home. This site computed it from the registry's UEF, the ratio of hot water delivered to energy used, which is 0.62 for this model, and from the daily hot-water draw the DOE test assigns to the high draw pattern. The source is DOE CCD, retrieved 2026-09-19. The class is the 414 models registered as a gas tank at this draw pattern, and its median is 260 therms. This model sits 13 therms above that median. Its rank is 367th lowest energy use of 414, which places it in the highest quarter of its class for energy use. The calculation method is documented on its own page.

The high draw pattern describes a larger household, or one where showers and laundry overlap. This model is registered at that pattern. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 84 gallons, and its rated volume is 48 gallons. Those are the values the registry lists. Whether they cover a particular household's busiest hour is not something this page can determine. Readers who compare units by energy use alone should note the 367th lowest position and the 13 therms gap to the median. The water heater selector filters by fuel, space and size, and the same-class replacement lookup searches by model number.

Running cost is not stated in the text because it depends on your state's average residential gas price. Multiplying 273 therms by the price you pay per therm gives a yearly figure at the federal test's daily draw. Multiplying 13 therms by the same price gives the yearly difference from the class median of 260 therms. Actual hot-water use in a home may differ from the test's daily draw, and how much it differs is not available in the registry data. The cost calculator applies the price for your ZIP to this figure. The installed-price range appears in its own block on this page, with its source and date, as a modeled range and not a quote.