RELIANCE WATER HEATERS ENT-50-1**

The registry does not print the 3,531 kWh figure. This site computed it from two inputs. The first is the model's UEF, the ratio of hot water delivered to energy used, listed as 0.92. The second is the daily hot-water draw the DOE test sets for the medium draw pattern. The UEF comes from the DOE CCD, retrieved 2026-09-19. The result holds only at that test draw. A household that draws more hot water each day will use more electricity than 3,531 kWh. A household that draws less will use less. The registry data does not show how much more or less. The inputs and steps are set out on the page explaining how the annual cost is calculated.

The medium draw pattern stands for a typical household on a busy morning, as DOE defines it. The registry lists a first hour rating, the gallons of hot water available in the first hour from a full tank, of 62 gallons. The rated volume is 46 gallons. A household whose busiest hour needs more than 62 gallons falls outside what this rating covers. The registry does not say how the unit performs beyond that point. Against the 426 electric tanks at the medium draw pattern, its 3,531 kWh sits at the median, 0 kWh away. To compare other fuels, spaces or sizes, use the water heater selector by fuel, space and size.

The running cost is not stated here because it depends on your own utility's electricity rate. The page computes it from your ZIP, using the 3,531 kWh figure at the medium draw pattern. You can run that step in the running cost calculator for your ZIP. The same 3,531 kWh input gives different costs under different tariffs. The installed price range appears in its own block, with its source and date. It is a modeled installed-cost range, not a quote. If you need a unit in the same class as the ENT-50-1**, the same-class replacement finder by model number lists the other models registered at the medium draw pattern.