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American ENJ-40 1**

American 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

American ENJ-40 1**: advertised and certified
American 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 American Read Oct 4, 2026
Size 35 gal 35 gal storage volume American Read Oct 4, 2026
UEF 0.93 0.93 American Read Oct 4, 2026
First-hour rating 54 gal 54 gal American Read Oct 4, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
E6N-40LS 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. Reheating lets it give 19 gallons beyond the 35 gallons in its tank. Of 477 electric storage models, 239 give more hot water in the first hour. Among electric storage models, the median first-hour rating is 55 gallons.

In tests, 93% of the energy it uses ends up as hot water (UEF 0.93). The daily hot water use in the test, called its draw pattern, was medium. Its UEF is lower than that of 20 of the 297 electric storage models with its draw pattern. For its type and draw pattern, the UEF runs from 0.91 to 0.95. Of the energy spent to reheat water, 98% goes into it (its recovery efficiency).

All of its test figures are shared by 4 other basic models. Each of the 4 other brands lists one of them. 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.