Midea MEWH40S82S1
Midea MEWH40S82S1 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 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 | Midea | Read Oct 5, 2026 |
Certified figures by listed model
| Model number | Storage volume (gal) | UEF | First-hour rating (gal) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|---|
| D40-45FH | 37 | 0.92 | 55 | 98% | Medium |
| MEWH40S82S1 | 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. 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. Its first-hour rating matches the median for electric storage models.
In the test, 8% of its energy does not reach the hot water (UEF 0.92). Its test simulated a day of medium hot water use (its draw pattern). Of 297 electric storage models with the same draw pattern, 81 have a higher UEF. 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.
It is the basic model for D40-45FH and MEWH40S82S1. All of its test figures are shared by 14 other basic models. In all, 7 other brands list one or more of them. You can find the whole group on the page for the A. O. Smith ENS-40 1**.
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 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 Midea 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.