LOCHINVAR ENJ-40 1**

This site calculates the 3,493 kWh figure. The registry does not publish it. It pairs the registry's UEF, the ratio of hot water delivered to energy used, with the DOE test's daily draw for the medium pattern. For this model the UEF is 0.93, taken from DOE's Compliance Certification Database (CCD) and retrieved 2026-09-19. The medium pattern stands for a typical household of several people with a busy morning. A household that draws more or less hot water than the test assumes will use a different amount than 3,493 kWh. The data does not say how large that difference would be. The steps are set out in how the annual energy and cost figures are calculated.

The tank'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 54 gallons. A household whose daily use is close to the medium pattern matches the conditions behind 3,493 kWh. The 54-gallon rating does not cover a household whose busiest hour needs more hot water than that. For energy use, the model ranks 153rd lowest of 426 in its class, so other models in the class use less. The water heater selector by fuel, space and size lets you check other models. The same-class replacement search by model number lists units in the same class.

The text gives no running cost for this model. The cost of 3,493 kWh a year depends on your own utility's electricity tariff, which this page does not know in advance. The running-cost calculator for your ZIP applies your local rate to the 3,493 kWh figure at the medium draw pattern. The 38 kWh gap to the class median has the same condition: its cost also depends on your tariff. Like the energy figure, both costs assume the test's daily draw. The installed price appears in its own block on this page with its source and date. It is a modeled range, not a quote.