AMERICAN GDV-40 3**

The figure of 185 therms is computed by this site, not by the registry. It uses the registry's UEF, the ratio of hot water delivered to energy used, which is 0.6 for this model, together with the DOE test's daily hot-water draw for the medium draw pattern. That pattern stands for a typical three- or four-person household. The source is DOE CCD, retrieved 2026-09-19, and the steps are set out in how the annual cost is calculated. The figure applies only to that test draw and to natural gas. A household that draws more or less hot water than the test will use a different amount, and this page does not estimate it.

This model sits 0 therms from the class median of 185 therms, so it uses the same energy as the middle of the 288 models registered as a gas tank at the medium draw pattern. Its rank of 89th lowest places it in the second-lowest quarter of its class for energy use. The comparison suits someone checking this unit against like units, for example through a same-class replacement search by model number. It does not compare across fuels or draw patterns. It also says nothing about capacity: the first hour rating, the gallons of hot water available in the first hour from a full tank, is 64 gallons, and the rated volume is 39 gallons.

The running cost is not written here because it depends on the state average residential gas price, which differs by location. The cost calculator on your own ZIP applies that price to the 185 therms shown above. 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 other fuels, spaces or sizes, use the water heater selector by fuel, space and size. This page has no energy figure for any draw pattern other than medium, so those values are not available here.