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State ENSB-30 1**

State ENSB-30 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 ENSB-30 1**.

Storage volume
27gallons
UEF
0.91Uniform energy factor
First-hour rating
50gallonsHot water in the first hour
See it among every electric storage model

Advertised and certified figures

State ENSB-30 1**: advertised and certified
State ENSB-30 1**: advertised and certified Size: advertised 30 gal, certified 27 gal (advertised nominal size, certified storage volume). Size: advertised 27 gal, certified 27 gal (certified storage volume). UEF: advertised 0.91, certified 0.91. First-hour rating: advertised 50 gal, certified 50 gal. Size · advertised nominal size, certified storage volume Advertised 30 gal Certified 27 gal Size · certified storage volume Advertised 27 gal Certified 27 gal UEF Advertised 0.91 Certified 0.91 First-hour rating Advertised 50 gal Certified 50 gal
FigureAdvertisedCertifiedAdvertiserRead
Size 30 gal, nominal size 27 gal storage volume State Read Oct 5, 2026
Size 27 gal 27 gal storage volume State Read Oct 5, 2026
UEF 0.91 0.91 State Read Oct 5, 2026
First-hour rating 50 gal 50 gal State Read Oct 5, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
EN6-30-DOBS 1**270.915098%Low

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

It holds 27 gallons in the test, 3 gallons less than its 30-gallon sold size. Starting full, it gives 50 gallons of hot water in its first hour of use. That is 23 gallons more than its tank holds, since it reheats during the hour. Among 477 electric storage models, 321 have a higher first-hour rating. The median electric storage model gives 55 gallons in its first hour.

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. Of 157 electric storage models with the same draw pattern, 81 have a higher UEF. A UEF of 0.92 is the median for its type and draw pattern. 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 them is listed under a different brand. For the full group, see the A. O. Smith ENSB-30 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.