LOCHINVAR ENJ-40W 1**

The registry does not publish the 2,466 kWh figure. This site calculates it. The calculation combines the registry's UEF, the ratio of hot water delivered to energy used, with the DOE test's daily hot-water draw for the low draw pattern. This unit's UEF is 0.91. The inputs come from the DOE CCD, retrieved 2026-09-19. Among the 163 electric tank models at the low draw pattern, this unit ranks 88th for lowest energy use. That puts it in the second-highest quarter of its class for energy use. Its gap to the class median is 27 kWh a year at the test's draw. The page on how the annual cost is calculated shows how the site turns the yearly figure into a cost.

The low draw pattern represents a one- or two-person household. The unit's rated volume is 35 gallons. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 38 gallons. The 2,466 kWh figure applies to a household of that size whose daily use is close to the test's draw. A larger household that uses more hot water each day does not meet that condition. This page has no energy figure for heavier daily use, because the figure here covers only the low draw pattern. If you are comparing sizes or fuels, use the selector by fuel, space and size. If you are matching a unit, you can find a same-class replacement by model number.

This text does not state the running cost. The cost is your own utility's electricity tariff applied to the 2,466 kWh yearly figure at the low draw pattern. The page calculates it from your ZIP, and the cost calculator on your own ZIP runs the same calculation. The unit uses 27 kWh more than the 2,439 kWh class median. What that gap costs you also depends on your rate. This site does not publish an installed price range for this model. The cost database's model was fitted on a range of ratings, and this model's ratings fall outside it. The site does not stretch the range to cover them. Energy use outside the low draw pattern is not available here.