State ENT-40 1**
State ENT-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 ENT-40 1**.
Certified figures
- Storage volume
- 36gallons
- UEF
- 0.92Uniform energy factor
- First-hour rating
- 53gallonsHot water in the first hour
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| Figure | Advertised | Certified | Advertiser | Read |
|---|---|---|---|---|
| Size | 40 gal, nominal size | 36 gal storage volume | State | Read Oct 5, 2026 |
| Size | 36 gal | 36 gal storage volume | State | Read Oct 5, 2026 |
| UEF | 0.92 | 0.92 | State | Read Oct 5, 2026 |
| First-hour rating | 53 gal | 53 gal | State | Read Oct 5, 2026 |
Certified figures by listed model
| Model number | Storage volume (gal) | UEF | First-hour rating (gal) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|---|
| EN6-40-DORT 1** | 36 | 0.92 | 53 | 98% | Medium |
| EN6-40-SORT 1** | 36 | 0.92 | 53 | 98% | Medium |
| EN8-40-DORT 1** | 36 | 0.92 | 53 | 98% | Medium |
| ESX-40-DONT 1** | 36 | 0.92 | 53 | 98% | Medium |
| SHN-40-DORT 1** | 36 | 0.92 | 53 | 98% | Medium |
| SHN-40-SORT 1** | 36 | 0.92 | 53 | 98% | Medium |
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 53 gallons in the test (its first-hour rating). Its tank holds 36 gallons, so reheating adds 17 gallons during the first hour. Among 477 electric storage models, 265 have a higher first-hour rating. 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). The daily hot water use in the test, called its draw pattern, was medium. Of 297 electric storage models with the same draw pattern, 81 have a higher UEF and 2 a lower one. On its draw pattern, its UEF is also the median electric storage UEF. When it reheats water in the test, 98% of the energy it uses ends up in the water.
It is sold under 6 model numbers in all. All of its test figures are shared by 7 other basic models. Each of the 7 other brands lists one of them. You can find the whole group on the page for the A. O. Smith ENT-40 1**.
Also listed as
They carry every figure in the table above.
- 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.