A. O. Smith HETF-55 1**
A. O. Smith HETF-55 1** is in the DOE listing as of Oct 26, 2026.
It has a labeled size of 55 gallons, a certified storage volume of 55 gallons, a certified UEF of 0.94, and a certified first-hour rating of 75 gallons of hot water.
Its advertised UEF of 0.94 from A. O. Smith matches the certified 0.94 (Read Oct 5, 2026).
- Electric storage water heater
- 7 listed models
ENERGY STAR certification does not cover this type of water heater.
Certified figures
- Storage volume
- 55gallons
- UEF
- 0.94Uniform energy factor
- First-hour rating
- 75gallonsHot water in the first hour
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Change your hourAdvertised and certified figures
| Figure | Advertised | Certified | Advertiser | Read |
|---|---|---|---|---|
| Size | 55 gal, nominal size | 55 gal storage volume | A. O. Smith | Read Oct 5, 2026 |
| Size | 55 gal | 55 gal storage volume | A. O. Smith | Read Oct 5, 2026 |
| UEF | 0.94 | 0.94 | A. O. Smith | Read Oct 5, 2026 |
| UEF | 0.92 | 0.94 | A. O. Smith | Read Oct 5, 2026 |
| First-hour rating | 75 gal | 75 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 |
|---|---|---|---|---|---|
| EEA12-55H55DVF 1** | 55 | 0.94 | 75 | 98% | High |
| EEA9-55H55DV 1** | 55 | 0.94 | 75 | 98% | High |
| EETU-55 1** | 55 | 0.94 | 75 | 98% | High |
| EEU6-55H45DV 1** | 55 | 0.94 | 75 | 98% | High |
| HETF-55 1** | 55 | 0.94 | 75 | 98% | High |
| HETFA-55 1** | 55 | 0.94 | 75 | 98% | High |
| PETU-55 1** | 55 | 0.94 | 75 | 98% | High |
UEF is the uniform energy factor. A dash means the model has no such figure.
Sold as 55 gallons, it holds 55 gallons in the test. Over one hour from a full tank, it gave 75 gallons in the test (its first-hour rating). Its tank holds 55 gallons, so reheating adds 20 gallons during the first hour. In the first hour, 14 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, 94% of the energy went to hot water, so its UEF is 0.94. The daily hot water use in the test, called its draw pattern, was high. No other electric storage model among the 23 on its draw pattern has a higher UEF. 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.
A tag or quote may show any of its 7 model numbers. Its test figures match those of 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 50-gallon electric storage water heater
- Every electric storage water heater
Not covered
- Changes to an advertised figure after the date beside it.