A. O. Smith ENT-50-1**
A. O. Smith ENT-50-1** is in the DOE listing as of Oct 26, 2026.
It has a labeled size of 50 gallons, a certified storage volume of 46 gallons, a certified UEF of 0.92, and a certified first-hour rating of 62 gallons of hot water.
Its advertised UEF of 0.92 from A. O. Smith matches the certified 0.92 (Read Oct 5, 2026).
- Electric storage water heater
- 7 listed models
ENERGY STAR certification does not cover this type of water heater.
Certified figures
- Storage volume
- 46gallons
- UEF
- 0.92Uniform energy factor
- First-hour rating
- 62gallonsHot water in the first hour
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| Figure | Advertised | Certified | Advertiser | Read |
|---|---|---|---|---|
| Size | 50 gal, nominal size | 46 gal storage volume | A. O. Smith | Read Oct 5, 2026 |
| Size | 50 gal, nominal size | 46 gal storage volume | Lowe's | Archived copy, Dec 9, 2025 |
| Size | 46 gal | 46 gal storage volume | A. O. Smith | Read Oct 5, 2026 |
| Size | 46 gal | 46 gal storage volume | Lowe's | Archived copy, Dec 9, 2025 |
| UEF | 0.92 | 0.92 | A. O. Smith | Read Oct 5, 2026 |
| UEF | 0.92 | 0.92 | Lowe's | Archived copy, Dec 9, 2025 |
| First-hour rating | 62 gal | 62 gal | A. O. Smith | Read Oct 5, 2026 |
| First-hour rating | 62 gal | 62 gal | Lowe's | Archived copy, Dec 9, 2025 |
Certified figures by listed model
| Model number | Storage volume (gal) | UEF | First-hour rating (gal) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|---|
| DEN-40 1** | 46 | 0.92 | 62 | 98% | Medium |
| E6-50H38D 1** | 46 | 0.92 | 62 | 98% | Medium |
| E6-50H45D 1** | 46 | 0.92 | 62 | 98% | Medium |
| E6-50H45DV 1** | 46 | 0.92 | 62 | 98% | Medium |
| ENT-50-1** | 46 | 0.92 | 62 | 98% | Medium |
| HNT-50 1** | 46 | 0.92 | 62 | 98% | Medium |
| PNT-50 1** | 46 | 0.92 | 62 | 98% | Medium |
UEF is the uniform energy factor. A dash means the model has no such figure.
It holds 46 gallons in the test, 4 gallons less than its 50-gallon sold size. Over one hour from a full tank, it gave 62 gallons in the test (its first-hour rating). Reheating lets it give 16 gallons beyond the 46 gallons in its tank. Of 477 electric storage models, 124 give more hot water in the first hour. The median electric storage model gives 55 gallons in its first hour.
In tests, 92% of the energy it uses ends up as hot water (UEF 0.92). Its test ran at the medium level of daily hot water use. Its UEF is lower than that of 81 of the 297 electric storage models with its draw pattern. For its type and draw pattern, its UEF sits at the median. When it reheats water in the test, 98% of the energy it uses ends up in the water.
All 7 of its model numbers carry the same certified figures. There are 5 more basic models with the same test figures. They are listed under 5 other brands, one each.
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.