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American ENSB-30 1**

American 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

American ENSB-30 1**: advertised and certified
American 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 American Read Oct 4, 2026
Size 27 gal 27 gal storage volume American Read Oct 4, 2026
UEF 0.91 0.91 American Read Oct 4, 2026
First-hour rating 50 gal 50 gal American Read Oct 4, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
E6N-30RB 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. Over one hour from a full tank, it gave 50 gallons in the test (its first-hour rating). Reheating lets it give 23 gallons beyond the 27 gallons in its tank. Among 477 electric storage models, 321 have a higher first-hour rating. Among electric storage models, the median first-hour rating is 55 gallons.

In the test, 9% of its energy does not reach the hot water (UEF 0.91). Its test simulated a day of low hot water use (its draw pattern). Its UEF is lower than that of 81 of the 157 electric storage models with its draw pattern. 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 the 4 other brands lists one of them. You can find the whole group on the page for 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.