Lochinvar GPDT-50 3**
Lochinvar GPDT-50 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 GPDT-50 3**.
Certified figures
- Storage volume
- 48gallons
- UEF
- 0.72Uniform energy factor
- First-hour rating
- 79gallonsHot water in the first hour
Your busiest hour
Change your hourCertified figures by listed model
| Model number | Storage volume (gal) | UEF | First-hour rating (gal) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|---|
| PRL05045ES 3*1 | 48 | 0.72 | 79 | 79% | High |
| PRL05045ESST 3*1 | 48 | 0.72 | 79 | 79% | High |
| PRN05045ES 3** | 48 | 0.72 | 79 | 79% | High |
| PRN05045ESST 3** | 48 | 0.72 | 79 | 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. It delivers 79 gallons of hot water in the test's first hour. That is 31 gallons more than its tank holds, since it reheats during the hour. In the first hour, 344 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 the test, 28% of its energy does not reach the hot water (UEF 0.72). The daily hot water use in the test, called its draw pattern, was high. Among 434 gas storage models on its draw pattern, 71 have a higher UEF. A UEF of 0.66 is the median for its type and draw pattern. Of the energy spent to reheat water, 79% goes into it (its recovery efficiency).
A tag or quote may show any of its 4 model numbers. There are 6 more basic models with the same test figures. Each of the 6 other brands lists one of them. For the full group, see the A. O. Smith GPDT-50 3** page.
It may qualify for 2 rebate programs.
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 50-gallon gas storage water heater
- Every gas storage water heater
- The most-searched gas storage models side by side
Not covered
- Advertised figures. We have none on file for this model.