A. O. Smith HETF-40 1**
A. O. Smith HETF-40 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 0.93, and a certified first-hour rating of 63 gallons of hot water.
Its advertised UEF of 0.93 from A. O. Smith matches the certified 0.93 (Read Oct 5, 2026).
- Electric storage water heater
- 6 listed models
ENERGY STAR certification does not cover this type of water heater.
Certified figures
- Storage volume
- 36gallons
- UEF
- 0.93Uniform energy factor
- First-hour rating
- 63gallonsHot 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 | 0.93 | 0.93 | A. O. Smith | Read Oct 5, 2026 |
| First-hour rating | 55 gal | 63 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 |
|---|---|---|---|---|---|
| EEA12-40H55DVF 1** | 36 | 0.93 | 63 | 98% | Medium |
| EEA9-40H55DV 1** | 36 | 0.93 | 63 | 98% | Medium |
| EETU-40 1** | 36 | 0.93 | 63 | 98% | Medium |
| EEU6-40H45DV 1** | 36 | 0.93 | 63 | 98% | Medium |
| HETF-40 1** | 36 | 0.93 | 63 | 98% | Medium |
| PETU-40 1** | 36 | 0.93 | 63 | 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. It delivers 63 gallons of hot water in the test's first hour. Its tank holds 36 gallons, so reheating adds 27 gallons during the first hour. In the first hour, 99 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 tests, 93% of the energy it uses ends up as hot water (UEF 0.93). Its test ran at the medium level of daily hot water use. Its UEF is lower than that of 20 of the 297 electric storage models with its draw pattern. A UEF of 0.92 is the median for its type and draw pattern. 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 4 other basic models. Each of the 4 other brands lists one of them.
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.