RELIANCE WATER HEATERS ENJB-40 1**

This site calculated the 3,456 kWh figure; the registry does not list it. The calculation uses the registry's UEF, the ratio of hot water delivered to energy used, and the DOE test's daily hot-water draw for the medium pattern. This model's UEF is 0.94. The DOE CCD data were retrieved on 2026-09-19. The yearly figure holds only at that test draw. A home that uses a different amount of hot water will have a different yearly figure. Among the 426 models in its class, this model ranks 137th lowest in energy use. That puts it in the second-lowest quarter of its class. You can see each step of the calculation in how the annual cost is calculated.

The first hour rating, the gallons of hot water available in the first hour from a full tank, is 57 gallons for this model. Its rated volume is 35 gallons. The first hour rating describes how much hot water the tank can supply at peak demand. The 3,456 kWh figure describes energy use over a year at the test draw. The unit fits a household whose busiest hour stays within 57 gallons of hot water. If a household often needs more than that in one hour, this rating does not cover its demand. To compare models by fuel, space and size, use the water heater selector. To find another electric tank at the medium draw pattern, use the same-class replacement search by model number.

Running cost is not given in this text because it depends on your own utility's electricity rate. The page calculates it from 3,456 kWh and the rate for your ZIP code. Enter your ZIP code in the cost calculator for your own ZIP to see that figure. The result has the same condition as the energy figure: the medium draw pattern at the federal test's daily draw. If your household uses a different amount of hot water, your actual cost will also differ. The installed price range appears in a separate block with its source and date. It is a modeled installed-cost range, not a quote from an installer.