ARISTON GN50T2-3-* vs Ruud RHE50: which uses less energy?
At the high draw pattern the Ruud RHE50 uses 212 therms a year and the ARISTON GN50T2-3-* 256 — 45 therms (18%) less, about 449 therms over ten years. Both are filed as a gas tank, so the comparison holds. Enter your ZIP below to price the difference.
Side by side
Compared within one class only: models filed as a gas tank at the high draw pattern.
| Figure | ARISTON GN50T2-3-* | Ruud RHE50 |
|---|---|---|
| UEF (Uniform Energy Factor) | 0.66 | 0.8 (better) |
| Energy use per year (therms) | 256 | 212 (better) |
| First hour rating (gal) | 86 | 87 |
| Rated storage volume (gal) | 47 | 46 |
| Installed cost range | $1,892–$3,395 | not published |
| 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 Ruud RHE50 if running cost matters most: it uses 45 therms less a year on the same test.
- Pick the ARISTON GN50T2-3-* if it is the one you can get installed sooner or for less — on the filed figures it has no advantage over the Ruud RHE50.
- Neither if your household's busiest hour needs more than 87 gallons of hot water — neither lists more. Check whether a 50-gallon heater is enough.
Each model on its own
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ARISTON GN50T2-3-*
Its filed figures, class position and running cost on your ZIP.
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Ruud RHE50
Its filed figures, class position and running cost on your ZIP.