LOCHINVAR GPDL-40 3** vs Rheem PROG40-36P RH67 PV: which uses less energy?
At the medium draw pattern the LOCHINVAR GPDL-40 3** and the Rheem PROG40-36P RH67 PV use the same energy, 163 therms a year each, on the same federal test. Both are filed as a gas tank, so the comparison holds; what separates them is below. Enter your ZIP to price either one on your own rate.
Side by side
Compared within one class only: models filed as a gas tank at the medium draw pattern.
| Figure | LOCHINVAR GPDL-40 3** | Rheem PROG40-36P RH67 PV |
|---|---|---|
| UEF (Uniform Energy Factor) | 0.68 | 0.68 |
| Energy use per year (therms) | 163 | 163 |
| First hour rating (gal) | 74 | 71 |
| Rated storage volume (gal) | 38 | 38 |
| Installed cost range | $1,877–$3,364 | $1,877–$3,364 |
| ENERGY STAR certified | not matched | not matched |
What it costs to run
Reliability
Not published: Reliability, failure rates and each model’s actual warranty term.
The registries these figures come from certify energy performance under a federal test; none of them records how long a unit lasts or how often it fails, so this page does not rank the two on reliability.
What is here instead:
- The filed efficiency, capacity and tank size of both models, side by side below.
- The actual warranty term is printed in each model’s documentation, not in any registry.
Which should you pick?
- Pick the LOCHINVAR GPDL-40 3** if its price or availability suits you — on energy the two are level.
- Pick the Rheem PROG40-36P RH67 PV if it is the one you can get installed sooner or for less — on the filed figures it has no advantage over the LOCHINVAR GPDL-40 3**.
- Neither if your household's busiest hour needs more than 74 gallons of hot water — neither lists more. Check whether a 40-gallon heater is enough.
Each model on its own
-
LOCHINVAR GPDL-40 3**
Its filed figures, class position and running cost on your ZIP.
-
Rheem PROG40-36P RH67 PV
Its filed figures, class position and running cost on your ZIP.