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State ENJ-40W 1**

State ENJ-40W 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-40W 1**.

Storage volume
35gallons
UEF
0.91Uniform energy factor
First-hour rating
38gallonsHot water in the first hour
See it among every electric storage model

Advertised and certified figures

State ENJ-40W 1**: advertised and certified
State ENJ-40W 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 0.91, certified 0.91. First-hour rating: advertised 38 gal, certified 38 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 0.91 Certified 0.91 First-hour rating Advertised 38 gal Certified 38 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 0.91 0.91 State Read Oct 4, 2026
First-hour rating 38 gal 38 gal State Read Oct 4, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
EN6-40-DOMSW 1**350.913898%Low

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 38 gallons of hot water in its first hour of use. Reheating lets it give 3 gallons beyond the 35 gallons in its tank. In the first hour, 459 of the 477 electric storage models give more hot water. Among electric storage models, the median first-hour rating is 55 gallons.

In tests, 91% of the energy it uses ends up as hot water (UEF 0.91). Its test ran at the low level of daily hot water use. Among 157 electric storage models on its draw pattern, 81 have a higher UEF. For its type and draw pattern, the UEF runs from 0.88 to 0.95. When it reheats water in the test, 98% of the energy it uses ends up in the water.

There are 6 more basic models with the same test figures. The A. O. Smith, American, and Lochinvar brands list one or more of them. You can find the whole group on the page for the A. O. Smith ENJ-40W 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.