A. O. SMITH GCRT-50 4**

The figure of 277 therms is computed by this site, not published by the registry. It starts from the registry's UEF, the ratio of hot water delivered to energy used, which is 0.61 for this model. That value is applied to the daily hot-water draw the DOE test sets for the high draw pattern. The source is DOE CCD, retrieved 2026-09-19. The figure applies only to that test draw and to natural gas, so a household that draws more or less hot water will use a different amount. The class is the 414 models registered as a gas tank at this draw pattern. Its median is 260 therms, and this model sits 17 therms above it.

The high draw pattern describes 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 89 gallons. The rated volume is 48 gallons. The data here does not say whether these figures cover a particular household's busiest hour, so that check is left to the reader. This model is registered for the high draw pattern, so its 277 therms figure applies to a household that matches it. To compare fuel, space and size across other options, use the water heater selector.

Running cost is not stated in this text because it depends on the state average residential gas price, which differs by reader. To see it for 277 therms of gas, use the cost calculator on your own ZIP. The method is described in how the annual cost is calculated. This model is 17 therms above the class median of 260 therms, so it does not suit a reader whose priority is the lowest gas use at the high draw pattern. It ranks 400th lowest of 414, which is the highest quarter of its class for energy use. A reader who wants a comparable unit can find a same-class replacement by model number. The modeled installed price range is shown in its own block on the page and is not restated here.