A. O. Smith GCG-50 4**
A. O. Smith GCG-50 4** is in the DOE listing as of Oct 26, 2026.
It has a labeled size of 50 gallons, a certified storage volume of 48 gallons, a certified UEF of 0.62, and a certified first-hour rating of 81 gallons of hot water.
Its advertised UEF of 0.62 from A. O. Smith matches the certified 0.62 (Read Oct 5, 2026).
- Gas storage water heater
- 10 listed models
Not listed as ENERGY STAR certified on Oct 26, 2026.
Certified figures
- Storage volume
- 48gallons
- UEF
- 0.62Uniform energy factor
- First-hour rating
- 81gallonsHot water in the first hour
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| Figure | Advertised | Certified | Advertiser | Read |
|---|---|---|---|---|
| Size | 50 gal, nominal size | 48 gal storage volume | A. O. Smith | Read Oct 5, 2026 |
| Size | 48 gal | 48 gal storage volume | A. O. Smith | Read Oct 5, 2026 |
| UEF | 0.62 | 0.62 | A. O. Smith | Read Oct 5, 2026 |
| UEF | up to 0.62 | 0.62 | A. O. Smith | Read Oct 5, 2026 |
| First-hour rating | 81 gal | 81 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 |
|---|---|---|---|---|---|
| G6N-T5040NVR 4** | 48 | 0.62 | 81 | 79% | High |
| G6N-T5040PVR 4*1 | 48 | 0.62 | 81 | 79% | High |
| GCG-50 4** | 48 | 0.62 | 81 | 79% | High |
| GCG-50 4*1 | 48 | 0.62 | 81 | 79% | High |
| GCG-50L 4** | 48 | 0.62 | 81 | 79% | High |
| GCG-50L 4*1 | 48 | 0.62 | 81 | 79% | High |
| HWG-50 4** | 48 | 0.62 | 81 | 79% | High |
| HWG-50 4*1 | 48 | 0.62 | 81 | 79% | High |
| XCG-50 4** | 48 | 0.62 | 81 | 79% | High |
| XCG-50 4*1 | 48 | 0.62 | 81 | 79% | High |
UEF is the uniform energy factor. A dash means the model has no such figure.
It holds 48 gallons in the test, 2 gallons less than its 50-gallon sold size. Over one hour from a full tank, it gave 81 gallons in the test (its first-hour rating). That is 33 gallons more than its tank holds, since it reheats during the hour. Of 763 gas storage models, 295 give more hot water in the first hour. The median gas storage model gives 78 gallons in the first hour of the test.
On Oct 26, 2026, this heater was not listed as ENERGY STAR certified. In the test, 38% of its energy does not reach the hot water (UEF 0.62). The daily hot water use in the test, called its draw pattern, was high. Of 434 gas storage models with the same draw pattern, 386 have a higher UEF. For its type and draw pattern, the UEF runs from 0.61 to 0.90. The water took in 79% of the energy used to reheat it (its recovery efficiency).
All 10 of its model numbers carry the same certified figures. All of its test figures are shared by 5 other basic models. They are listed under 5 other brands, one each.
Also listed as
They carry every figure in the table above.
- Every A. O. Smith basic model
- Every 50-gallon gas storage water heater
- Every gas storage water heater
- The most-searched gas storage models side by side
Not covered
- Changes to an advertised figure after the date beside it.