Rheem PRO+G55-50N RH59 vs Ruud PRO+G55-45U RH59 EC1*: which uses less energy?
At the high draw pattern the Rheem PRO+G55-50N RH59 and the Ruud PRO+G55-45U RH59 EC1* use the same energy, 273 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 | Rheem PRO+G55-50N RH59 | Ruud PRO+G55-45U RH59 EC1* |
|---|---|---|
| UEF (Uniform Energy Factor) | 0.62 | 0.62 |
| Energy use per year (therms) | 273 | 273 |
| First hour rating (gal) | 91 | 99 |
| Rated storage volume (gal) | 55 | 55 |
| Installed cost range | $1,777–$3,088 | $1,777–$3,088 |
| 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 Rheem PRO+G55-50N RH59 if its price or availability suits you — on energy the two are level.
- Pick the Ruud PRO+G55-45U RH59 EC1* if you need more hot water in your busiest hour: it lists a first hour rating of 99 gallons against 91.
- Neither if your household's busiest hour needs more than 99 gallons of hot water — neither lists more. Check whether a 50-gallon heater is enough.
Each model on its own
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Rheem PRO+G55-50N RH59
Its filed figures, class position and running cost on your ZIP.
-
Ruud PRO+G55-45U RH59 EC1*
Its filed figures, class position and running cost on your ZIP.