Lochinvar GPDL-40 3**
Lochinvar GPDL-40 3** is in the DOE listing as of Oct 26, 2026.
- Gas storage water heater
- 4 listed models
Not listed as ENERGY STAR certified on Oct 26, 2026.
Its figures are also listed under A. O. Smith GPDL-40 3**.
Certified figures
- Storage volume
- 38gallons
- UEF
- 0.68Uniform energy factor
- First-hour rating
- 74gallonsHot water in the first hour
Your busiest hour
Change your hourAdvertised and certified figures
| Figure | Advertised | Certified | Advertiser | Read |
|---|---|---|---|---|
| Size | 40 gal, nominal size | 38 gal storage volume | Lochinvar | Read Oct 5, 2026 |
| First-hour rating | 74 gal | 74 gal | Lochinvar | Read Oct 5, 2026 |
Certified figures by listed model
| Model number | Storage volume (gal) | UEF | First-hour rating (gal) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|---|
| PRL04040ES 3*1 | 38 | 0.68 | 74 | 79% | Medium |
| PRL04040ESST 3*1 | 38 | 0.68 | 74 | 79% | Medium |
| PRN04040ES 3** | 38 | 0.68 | 74 | 79% | Medium |
| PRN04040ESST 3** | 38 | 0.68 | 74 | 79% | Medium |
UEF is the uniform energy factor. A dash means the model has no such figure.
It holds 38 gallons in the test, 2 gallons less than its 40-gallon sold size. Starting full, it gives 74 gallons of hot water in its first hour of use. That is 36 gallons more than its tank holds, since it reheats during the hour. In the first hour, 466 of the 763 gas storage models give more hot water. Among gas storage models, the median first-hour rating is 78 gallons.
As of Oct 26, 2026, it was not listed as ENERGY STAR certified. In tests, 68% of the energy went to hot water, so its UEF is 0.68. Its test simulated a day of medium hot water use (its draw pattern). Its UEF is lower than that of 4 of the 288 gas storage models with its draw pattern. For its type and draw pattern, the median UEF is 0.60. The water took in 79% of the energy used to reheat it (its recovery efficiency).
A tag or quote may show any of its 4 model numbers. Its test figures match those of 6 other basic models. Each of them is listed under a different brand. For the full group, see the A. O. Smith GPDL-40 3** page.
In 2 states, 2 rebate programs may accept it.
Also listed as
They carry every figure in the table above.
Rebates
| Program | State | Status | Program page |
|---|---|---|---|
| Xcel Energy MINNESOTA RESIDENTIAL ENERGY EFFICIENCY PROGRAMS (gas storage, gas tankless) | MN | May qualify | Its own page |
| Avista Home and small commercial: HVAC and water heating incentives (gas storage) | WA | May qualify | Its own page |
Programs change their terms. Check the program's own page before you buy.
- Every Lochinvar basic model
- Every 40-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.