A. O. Smith ENLB-50 1**
A. O. Smith ENLB-50 1** is in the DOE listing as of Oct 26, 2026.
It has a labeled size of 48 gallons, a certified storage volume of 44 gallons, a certified UEF of 0.93, and a certified first-hour rating of 60 gallons of hot water.
Its advertised UEF of 0.93 from A. O. Smith matches the certified 0.93 (Read Oct 4, 2026).
- Electric storage water heater
- 3 listed models
ENERGY STAR certification does not cover this type of water heater.
Certified figures
- Storage volume
- 44gallons
- UEF
- 0.93Uniform energy factor
- First-hour rating
- 60gallonsHot water in the first hour
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| Figure | Advertised | Certified | Advertiser | Read |
|---|---|---|---|---|
| Size | 48 gal, nominal size | 44 gal storage volume | A. O. Smith | Read Oct 4, 2026 |
| Size | 48 gal, nominal size | 44 gal storage volume | Lowe's | Archived copy, Oct 1, 2024 |
| Size | 44 gal | 44 gal storage volume | A. O. Smith | Read Oct 4, 2026 |
| UEF | 0.93 | 0.93 | A. O. Smith | Read Oct 4, 2026 |
| UEF | 0.93 | 0.93 | Lowe's | Archived copy, Oct 1, 2024 |
| First-hour rating | 60 gal | 60 gal | A. O. Smith | Read Oct 4, 2026 |
| First-hour rating | 60 gal | 60 gal | Lowe's | Archived copy, Oct 1, 2024 |
Certified figures by listed model
| Model number | Storage volume (gal) | UEF | First-hour rating (gal) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|---|
| E6-50L45DVB 1** | 44 | 0.93 | 60 | 98% | Medium |
| ENLB-50 1** | 44 | 0.93 | 60 | 98% | Medium |
| PNLB-50 1** | 44 | 0.93 | 60 | 98% | Medium |
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. Over one hour from a full tank, it gave 60 gallons in the test (its first-hour rating). Reheating lets it give 16 gallons beyond the 44 gallons in its tank. In the first hour, 145 of the 477 electric storage models give more hot water. Among electric storage models, the median first-hour rating is 55 gallons.
In the test, 7% of its energy does not reach the hot water (UEF 0.93). Its test ran at the medium level of daily hot water use. Its UEF is lower than that of 20 of the 297 electric storage models with its draw pattern. For its type and draw pattern, the median UEF is 0.92. When it reheats water in the test, 98% of the energy it uses ends up in the water.
Its 3 model numbers are E6-50L45DVB 1**, ENLB-50 1**, and PNLB-50 1**. Its test figures match those of 5 other basic models. Each of them is listed under a different brand.
Also listed as
They carry every figure in the table above.
- Every A. O. Smith basic model
- Every 50-gallon electric storage water heater
- Every electric storage water heater
Not covered
- Changes to an advertised figure after the date beside it.