American ENS-40 1**
American ENS-40 1** is in the DOE listing as of Oct 19, 2026.
- Electric storage water heater
- 8 listed models
ENERGY STAR certification does not cover this type of water heater.
Its figures are also listed under A. O. Smith ENS-40 1**.
Certified figures
- Storage volume
- 37gallons
- UEF
- 0.92Uniform energy factor
- First-hour rating
- 55gallonsHot water in the first hour
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| Figure | Advertised | Certified | Advertiser | Read |
|---|---|---|---|---|
| Size | 40 gal, nominal size | 37 gal storage volume | American | Read Oct 4, 2026 |
| Size | 37 gal | 37 gal storage volume | American | Read Oct 4, 2026 |
| UEF | 0.92 | 0.92 | American | Read Oct 4, 2026 |
| First-hour rating | 55 gal | 55 gal | American | Read Oct 4, 2026 |
Certified figures by listed model
| Model number | Storage volume (gal) | UEF | First-hour rating (gal) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|---|
| E10N-40R 1** | 37 | 0.92 | 55 | 98% | Medium |
| E6N-40R 1** | 37 | 0.92 | 55 | 98% | Medium |
| E8N-40R 1** | 37 | 0.92 | 55 | 98% | Medium |
| LDCE32-30R-045DV 1** | 37 | 0.92 | 55 | 98% | Medium |
| LDCE32-30R-050DV 1* | 37 | 0.92 | 55 | 98% | Medium |
| LDCE32-30R-055DV 1** | 37 | 0.92 | 55 | 98% | Medium |
| LDCE32-30R-060DV 1** | 37 | 0.92 | 55 | 98% | Medium |
| NE3F40RD 1** | 37 | 0.92 | 55 | 98% | Medium |
UEF is the uniform energy factor. A dash means the model has no such figure.
It holds 37 gallons in the test, 3 gallons less than its 40-gallon sold size. It delivers 55 gallons of hot water in the test's first hour. That is 18 gallons more than its tank holds, since it reheats during the hour. Among 477 electric storage models, 204 have a higher first-hour rating. In first-hour rating, it ties the median electric storage model.
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. Of the energy spent to reheat water, 98% goes into it (its recovery efficiency).
It is sold under 8 model numbers in all. There are 14 more basic models with the same test figures. In all, 7 other brands list one or more of them. For the full group, see the A. O. Smith ENS-40 1**.
Also listed as
They carry every figure in the table above.
- A. O. Smith ENS-40 1**
- Lochinvar ENS-40 1**
- Midea D40-45FH
- Midea D40-45FJ
- Midea MEWH40S82S1
- Midea MEWH40T82S1
- MRCOOL MEWH40S82S1
- MRCOOL MEWH40T82S1
- MRCOOL MTWH04540E
- MRCOOL MTWH04540ET
- RELIANCE WATER HEATERS ENS-40 1**
- State ENS-40 1**
2 more basic models carry these figures.
- Every American basic model
- Every 40-gallon electric storage water heater
- Every electric storage water heater
Not covered
- Changes to an advertised figure after the date beside it.