Hot Water List
Menu

State ENJ-40 1**

State ENJ-40 1** is in the DOE listing as of Oct 19, 2026.

  • Electric storage water heater
  • 1 listed model

ENERGY STAR certification does not cover this type of water heater.

Its figures are also listed under A. O. Smith ENJ-40 1**.

Storage volume
35gallons
UEF
0.93Uniform energy factor
First-hour rating
54gallonsHot water in the first hour
See it among every electric storage model

Advertised and certified figures

State ENJ-40 1**: advertised and certified
State ENJ-40 1**: advertised and certified Size: advertised 38 gal, certified 35 gal (advertised nominal size, certified storage volume). Size: advertised 35 gal, certified 35 gal (certified storage volume). UEF: advertised 0.93, certified 0.93. First-hour rating: advertised 54 gal, certified 54 gal. Size · advertised nominal size, certified storage volume Advertised 38 gal Certified 35 gal Size · certified storage volume Advertised 35 gal Certified 35 gal UEF Advertised 0.93 Certified 0.93 First-hour rating Advertised 54 gal Certified 54 gal
FigureAdvertisedCertifiedAdvertiserRead
Size 38 gal, nominal size 35 gal storage volume State Read Oct 4, 2026
Size 35 gal 35 gal storage volume State Read Oct 4, 2026
UEF 0.93 0.93 State Read Oct 4, 2026
First-hour rating 54 gal 54 gal State Read Oct 4, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
EN6-40-DOMS 1**350.935498%Medium

UEF is the uniform energy factor. A dash means the model has no such figure.

It holds 35 gallons in the test, 3 gallons less than its 38-gallon sold size. Starting full, it gives 54 gallons of hot water in its first hour of use. That is 19 gallons more than its tank holds, since it reheats during the hour. In the first hour, 239 of the 477 electric storage models give more hot water. The median electric storage model gives 55 gallons in the first hour of the test.

In tests, 93% of the energy went to hot water, so its UEF is 0.93. The daily hot water use in the test, called its draw pattern, was medium. Of 297 electric storage models with the same draw pattern, 20 have a higher UEF and 216 a lower one. A UEF of 0.92 is the median for its type and draw pattern. The water took in 98% of the energy used to reheat it (its recovery efficiency).

There are 4 more basic models with the same test figures. Each of them is listed under a different brand. You can find the whole group on the page for the A. O. Smith ENJ-40 1**.

Also listed as

They carry every figure in the table above.

Updated Oct 19, 2026 · Methodology

Not covered

  • Changes to an advertised figure after the date beside it.