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State ENJB-40 1**

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

  • Electric storage water heater
  • 2 listed models

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

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

Storage volume
35gallons
UEF
0.94Uniform energy factor
First-hour rating
57gallonsHot water in the first hour
See it among every electric storage model

Advertised and certified figures

State ENJB-40 1**: advertised and certified
State ENJB-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 0.94, certified 0.94. First-hour rating: advertised 57 gal, certified 57 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 0.94 Certified 0.94 First-hour rating Advertised 57 gal Certified 57 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 0.94 0.94 State Read Oct 4, 2026
First-hour rating 57 gal 57 gal State Read Oct 4, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
EN6-40-DOMBS 1**350.945798%Medium
EN6-40-SOMBS 1**350.945798%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. Over one hour from a full tank, it gave 57 gallons in the test (its first-hour rating). Reheating lets it give 22 gallons beyond the 35 gallons in its tank. In the first hour, 177 of the 477 electric storage models give more hot water. The median electric storage model gives 55 gallons in its first hour.

In tests, 94% of the energy went to hot water, so its UEF is 0.94. Its test ran at the medium level of daily hot water use. Of 297 electric storage models with the same draw pattern, 4 have a higher UEF. For its type and draw pattern, the UEF runs from 0.91 to 0.95. The water took in 98% of the energy used to reheat it (its recovery efficiency).

Its 2 model numbers are EN6-40-DOMBS 1** and EN6-40-SOMBS 1**. Its test figures match those of 4 other basic models. They are listed under 4 other brands, one each. For the full group, see the A. O. Smith ENJB-40 1** page.

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.