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A. O. Smith ENS-30 1**

A. O. Smith ENS-30 1** is in the DOE listing as of Oct 26, 2026.

It has a labeled size of 30 gallons, a certified storage volume of 27 gallons, a certified UEF of 0.89, and a certified first-hour rating of 47 gallons of hot water.

Its advertised UEF of 0.95 from A. O. Smith differs from the certified 0.89 (Read Oct 4, 2026).

  • Electric storage water heater
  • 3 listed models

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

Storage volume
27gallons
UEF
0.89Uniform energy factor
First-hour rating
47gallonsHot water in the first hour
See it among every electric storage model

Advertised and certified figures

A. O. Smith ENS-30 1**: advertised and certified
A. O. Smith ENS-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 0.95, certified 0.89. UEF: advertised 0.89, certified 0.89. 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 0.95 Certified 0.89 UEF Advertised 0.89 Certified 0.89
FigureAdvertisedCertifiedAdvertiserRead
Size 30 gal, nominal size 27 gal storage volume A. O. Smith Read Oct 4, 2026
Size 30 gal, nominal size 27 gal storage volume Lowe's Archived copy, Oct 1, 2024
Size 27 gal 27 gal storage volume A. O. Smith Read Oct 4, 2026
UEF 0.95 0.89 A. O. Smith Read Oct 4, 2026
UEF 0.89 0.89 A. O. Smith Read Oct 4, 2026
UEF 0.89 0.89 Lowe's Archived copy, Oct 1, 2024
First-hour rating 47 gal 47 gal A. O. Smith Read Oct 4, 2026
First-hour rating 47 gal 47 gal Lowe's Archived copy, Oct 1, 2024

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
E6-30R45DV 1**270.894798%Low
ENS-30 1**270.894798%Low
PNS-30 1**270.894798%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. It delivers 47 gallons of hot water in the test's first hour. That is 20 gallons more than its tank holds, since it reheats during the hour. Of 477 electric storage models, 350 give more hot water in the first hour. The median electric storage model gives 55 gallons in the first hour of the test.

In tests, 89% of the energy went to hot water, so its UEF is 0.89. The daily hot water use in the test, called its draw pattern, was low. Among 157 electric storage models on its draw pattern, 136 have a higher UEF. On its draw pattern, the median electric storage UEF is 0.92. When it reheats water in the test, 98% of the energy it uses ends up in the water.

It is the basic model for E6-30R45DV 1**, ENS-30 1**, and PNS-30 1**. Its test figures match those of 4 other basic models. Each of them is listed under a different brand.

Also listed as

They carry every figure in the table above.

Updated Oct 26, 2026 · Methodology

Not covered

  • Changes to an advertised figure after the date beside it.