AMERICAN GUF-50 1** vs FRIEDRICH PROG50S-36N RH67 PV: which uses less energy?
At the high draw pattern the AMERICAN GUF-50 1** and the FRIEDRICH PROG50S-36N RH67 PV use the same energy, 242 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 high draw pattern.
| Figure | AMERICAN GUF-50 1** | FRIEDRICH PROG50S-36N RH67 PV |
|---|---|---|
| UEF (Uniform Energy Factor) | 0.7 | 0.7 |
| Energy use per year (therms) | 242 | 242 |
| First hour rating (gal) | 83 | 78 |
| Rated storage volume (gal) | 48 | 48 |
| Installed cost range | $2,141–$4,033 | $2,141–$4,033 |
| 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 AMERICAN GUF-50 1** if its price or availability suits you — on energy the two are level.
- Pick the FRIEDRICH PROG50S-36N 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 AMERICAN GUF-50 1**.
- Neither if your household's busiest hour needs more than 83 gallons of hot water — neither lists more. Check whether a 50-gallon heater is enough.
Each model on its own
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AMERICAN GUF-50 1**
Its filed figures, class position and running cost on your ZIP.
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FRIEDRICH PROG50S-36N RH67 PV
Its filed figures, class position and running cost on your ZIP.