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State ENLB-50W 1**

State ENLB-50W 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 ENLB-50W 1**.

Storage volume
44gallons
UEF
0.91Uniform energy factor
First-hour rating
40gallonsHot water in the first hour
See it among every electric storage model

Advertised and certified figures

State ENLB-50W 1**: advertised and certified
State ENLB-50W 1**: advertised and certified Size: advertised 48 gal, certified 44 gal (advertised nominal size, certified storage volume). Size: advertised 44 gal, certified 44 gal (certified storage volume). UEF: advertised 0.91, certified 0.91. First-hour rating: advertised 40 gal, certified 40 gal. Size · advertised nominal size, certified storage volume Advertised 48 gal Certified 44 gal Size · certified storage volume Advertised 44 gal Certified 44 gal UEF Advertised 0.91 Certified 0.91 First-hour rating Advertised 40 gal Certified 40 gal
FigureAdvertisedCertifiedAdvertiserRead
Size 48 gal, nominal size 44 gal storage volume State Read Oct 4, 2026
Size 44 gal 44 gal storage volume State Read Oct 4, 2026
UEF 0.91 0.91 State Read Oct 4, 2026
First-hour rating 40 gal 40 gal State Read Oct 4, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
EN6-50-DOLBSW 1**440.914098%Low
ESX-50-DOLBSW 1**440.914098%Low

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

It holds 44 gallons in the test, 4 gallons less than its 48-gallon sold size. It delivers 40 gallons of hot water in the test's first hour. Among 477 electric storage models, 444 have a higher first-hour rating. Among electric storage models, the median first-hour rating is 55 gallons.

In tests, 91% of the energy went to hot water, so its UEF is 0.91. The daily hot water use in the test, called its draw pattern, was low. 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. Of the energy spent to reheat water, 98% goes into it (its recovery efficiency).

Its 2 model numbers are EN6-50-DOLBSW 1** and ESX-50-DOLBSW 1**. All of its test figures are shared by 2 other basic models. The A. O. Smith and Lochinvar brands list one or more of them. For the full group, see the A. O. Smith ENLB-50W 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.