AMERICAN GDVNL-40L 1**

The annual figure of 182 therms 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 0.61 with the federal test's daily hot-water draw for the medium draw pattern. The source is DOE CCD, retrieved 2026-09-19. Among the 288 models registered as a gas tank at this draw pattern, this model has the 73rd lowest energy use of 288. That places it in the second-lowest quarter of its class. Its figure sits 3 therms below the class median of 185 therms, and both values apply only to natural gas at the medium draw pattern.

The first hour rating, the gallons of hot water available in the first hour from a full tank, is 64 gallons for this model. The rated volume is 38 gallons. The energy figure suits a household whose hot-water use resembles the medium draw pattern, a typical household on a busy morning. It does not describe a household with heavier or lighter use, and the registry data give no figure for those cases. Whether the first hour rating of 64 gallons covers a particular household's peak demand is not stated in the data. To narrow a search by fuel, space and size, use the water heater selector.

Running cost is not stated here because it depends on the state average residential gas price, which differs by reader. Apply your own rate to 182 therms at the medium draw pattern, or enter your ZIP in the cost calculator. The methodology page explains how the annual cost is calculated from the UEF of 0.61. The installed price range appears in its own block with its source and date, as a modeled installed-cost range and not a quote. To compare GDVNL-40L 1** with a unit in the same class, you can find a replacement by model number. Without a rate, no cost figure is available on this page.