State ENS-40 1**
State ENS-40 1** is in the DOE listing as of Oct 19, 2026.
- Electric storage water heater
- 6 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 | State | Read Oct 4, 2026 |
| Size | 37 gal | 37 gal storage volume | State | Read Oct 4, 2026 |
| UEF | 0.92 | 0.92 | State | Read Oct 4, 2026 |
| First-hour rating | 55 gal | 55 gal | State | Read Oct 4, 2026 |
Certified figures by listed model
| Model number | Storage volume (gal) | UEF | First-hour rating (gal) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|---|
| EN6-40-DORS 1** | 37 | 0.92 | 55 | 98% | Medium |
| EN6-40-SORS 1** | 37 | 0.92 | 55 | 98% | Medium |
| EN8-40-DORS 1** | 37 | 0.92 | 55 | 98% | Medium |
| ESX-40-DONS 1** | 37 | 0.92 | 55 | 98% | Medium |
| FN6-40-DORS 1** | 37 | 0.92 | 55 | 98% | Medium |
| PCE-30-2ORTA 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. Starting full, it gives 55 gallons of hot water in its first hour of use. Reheating lets it give 18 gallons beyond the 37 gallons in its tank. Among 477 electric storage models, 204 have a higher first-hour rating. The median electric storage model gives the same amount in its first hour.
In tests, 92% of the energy it uses ends up as hot water (UEF 0.92). In the test, daily hot water use was set to medium (its draw pattern). Its UEF is lower than that of 81 of the 297 electric storage models with its draw pattern. Its UEF is the median for its type and draw pattern. The water took in 98% of the energy used to reheat it (its recovery efficiency).
A tag or quote may show any of its 6 model numbers. Its test figures match those of 14 other basic models. In all, 7 other brands list one or more of them. For the full group, see the A. O. Smith ENS-40 1** page.
Also listed as
They carry every figure in the table above.
- A. O. Smith ENS-40 1**
- American 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**
2 more basic models carry these figures.
- Every State 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.