Gas storage water heaters side by side
The 2 most-searched gas storage models, with the certified figures of each.
These tanks are sold in sizes of 40 to 50 gallons, depending on the model. Starting full, the tank with the most first-hour hot water gives 79 gallons. Among these tanks, the A. O. Smith GPVL-50 2** is the one with that figure. The tank reheats during the hour, so 79 gallons tops the largest tank size here.
Their UEF figures do not compare, since these gas storage models were not all tested on one draw pattern. Not one of these gas storage models is listed as ENERGY STAR certified.
All 2 models here may qualify for at least one rebate program. Each of these gas storage models has figures that other basic models carry too. With the other basic models that carry the same figures, they come to 14 basic models.
Every gas storage model by efficiency and first-hour hot water
Up is more hot water in the first hour of use, starting full. Right is more efficient. A UEF compares only between models tested on the same draw pattern, so the chart shows one pattern at a time, the most common first.
32 models with no draw pattern listed are on the full list, not on the chart.
Certified figures
In order of size, smallest first, then UEF, highest first.
| Figure | A. O. Smith GPVL-40 2** | A. O. Smith GPVL-50 2** |
|---|---|---|
| Size (gal) | 40 | 50 |
| Storage volume (gal) | 38 | 49 |
| UEF | 0.67 | 0.72 |
| Draw pattern | Medium | High |
| First-hour rating (gal) | 73 | 79 |
| Recovery efficiency | 79% | 80% |
| ENERGY STAR | — | — |
| Listed models | 3 | 4 |
| Rebate programs (may qualify) | 2 | 2 |
| Also listed as | 6 basic models | 6 basic models |
UEF is the uniform energy factor. A UEF compares only between models with the same draw pattern. A range means the listed models differ. A dash means no such figure, or not listed as ENERGY STAR certified.
Also listed as
A. O. Smith GPVL-40 2**
- American GPVL-40 2**
- GSW WATER HEATERS GPVL-40 2**
- John Wood GPVL-40 2**
- Lochinvar GPVL-40 2**
- RELIANCE WATER HEATERS GPVL-40 2**
- State GPVL-40 2**
A. O. Smith GPVL-50 2**
- American GPVL-50 2**
- GSW WATER HEATERS GPVL-50 2**
- John Wood GPVL-50 2**
- Lochinvar GPVL-50 2**
- RELIANCE WATER HEATERS GPVL-50 2**
- State GPVL-50 2**
Each carries every figure in its column.
Every gas storage water heater with its certified figures
Not covered
- Price, warranty, and installation.
- Models searched for less often. Each one is on the full list.