A. O. SMITH GUR 40 4**

The 264 therms figure 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 0.64 for this model. That value is applied to the DOE test's daily hot-water draw for the high pattern, using DOE CCD data retrieved on 2026-09-19. The result holds only at that test draw. Energy use at any other daily draw is not available from the registry, and this page does not estimate it. A plumber or seller checking a quoted figure should compare it at the same draw pattern and fuel, natural gas. The steps behind the calculation are set out in how the annual energy and cost figures are calculated.

The high draw pattern stands for a larger household, or one where showers and laundry overlap. This model's first hour rating, the gallons of hot water available in the first hour from a full tank, is 83 gallons. Its rated volume is 38 gallons. The first hour rating is a federal test result, not a measure taken in a particular home. A household whose daily use is well below the high pattern sits outside the condition behind the 264 therms figure. Whether the rating covers a given household's peak hour is not stated in the data. A replacement check can compare these figures with the unit being removed, using the same-class replacement search by model number.

Against the 414 models registered as a gas tank at the high draw pattern, this unit falls in the second-highest quarter for energy use. Its 4 therms gap above the median is the whole difference the data shows; the reason for it is not available. The running cost is not stated in this text. It depends on your state's average residential natural gas price, so the page computes it from your ZIP. You can see it on your own rate in the water heater running cost calculator by ZIP. The installed price appears in its own block with its source and date. It is a modeled installed-cost range, not a quote.