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State ENLB-40W 1**

State ENLB-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 ENLB-40W 1**.

Storage volume
35gallons
UEF
0.90Uniform energy factor
First-hour rating
38gallonsHot water in the first hour
See it among every electric storage model

Advertised and certified figures

State ENLB-40W 1**: advertised and certified
State ENLB-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 0.90, certified 0.90. 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 0.90 Certified 0.90 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 0.90 0.90 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-DOLBSW 1**350.903898%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. Over one hour from a full tank, it gave 38 gallons in the test (its first-hour rating). Its tank holds 35 gallons, so reheating adds 3 gallons during the first hour. Among 477 electric storage models, 459 have a higher first-hour rating. Among electric storage models, the median first-hour rating is 55 gallons.

In tests, 90% of the energy went to hot water, so its UEF is 0.90. The daily hot water use in the test, called its draw pattern, was low. Of 157 electric storage models with the same draw pattern, 115 have a higher UEF. On its draw pattern, the median electric storage UEF is 0.92. Of the energy spent to reheat water, 98% goes into it (its recovery efficiency).

Its test figures match those of 3 other basic models. Those basic models are sold with A. O. Smith, American, and Lochinvar as their brand names. For the full group, see the A. O. Smith ENLB-40W 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.