A. O. Smith MHE6-40RW-035D-1**
A. O. Smith MHE6-40RW-035D-1** is in the DOE listing as of Oct 26, 2026.
It has a labeled size of 40 gallons, a certified storage volume of 36 gallons, a certified UEF of 0.91, and a certified first-hour rating of 40 gallons of hot water.
Its advertised UEF of 0.95 from A. O. Smith differs from the certified 0.91 (Read Oct 5, 2026).
- Electric storage water heater
- 3 listed models
ENERGY STAR certification does not cover this type of water heater.
Certified figures
- Storage volume
- 36gallons
- UEF
- 0.91Uniform energy factor
- First-hour rating
- 40gallonsHot water in the first hour
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Change your hourAdvertised and certified figures
| Figure | Advertised | Certified | Advertiser | Read |
|---|---|---|---|---|
| Size | 40 gal, nominal size | 36 gal storage volume | A. O. Smith | Read Oct 5, 2026 |
| Size | 36 gal | 36 gal storage volume | A. O. Smith | Read Oct 5, 2026 |
| UEF | 0.95 | 0.91 | A. O. Smith | Read Oct 5, 2026 |
| UEF | 0.91 | 0.91 | A. O. Smith | Read Oct 5, 2026 |
| First-hour rating | 40 gal | 40 gal | A. O. Smith | Read Oct 5, 2026 |
Certified figures by listed model
| Model number | Storage volume (gal) | UEF | First-hour rating (gal) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|---|
| EMHS-40W-1** | 36 | 0.91 | 40 | 98% | Low |
| MHE6-40RW-030D-1** | 36 | 0.91 | 40 | 98% | Low |
| MHE6-40RW-035D-1** | 36 | 0.91 | 40 | 98% | Low |
UEF is the uniform energy factor. A dash means the model has no such figure.
It holds 36 gallons in the test, 4 gallons less than its 40-gallon sold size. Over one hour from a full tank, it gave 40 gallons in the test (its first-hour rating). Reheating lets it give 4 gallons beyond the 36 gallons in its tank. In the first hour, 444 of the 477 electric storage models give more hot water. The median electric storage model gives 55 gallons in the first hour of the test.
In the test, 9% of its energy does not reach the hot water (UEF 0.91). The daily hot water use in the test, called its draw pattern, was low. Of 157 electric storage models with the same draw pattern, 81 have a higher UEF. On its draw pattern, the median electric storage UEF is 0.92. The water took in 98% of the energy used to reheat it (its recovery efficiency).
Its 3 model numbers are EMHS-40W-1**, MHE6-40RW-030D-1**, and MHE6-40RW-035D-1**. There are 3 more basic models with the same test figures. Of those, one or more are under the American, RELIANCE WATER HEATERS, and State brands.
Also listed as
They carry every figure in the table above.
- Every A. O. Smith 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.