RINNAI REHP80W vs VAUGHN THERMAL MP80F-RC: which uses less energy?
At the high draw pattern the RINNAI REHP80W uses 1,240 kWh a year and the VAUGHN THERMAL MP80F-RC 1,306 — 65 kWh (5%) less, about 653 kWh over ten years. Both are filed as an electric tank, so the comparison holds. Enter your ZIP below to price the difference.
Side by side
Compared within one class only: models filed as an electric tank at the high draw pattern.
| Figure | RINNAI REHP80W | VAUGHN THERMAL MP80F-RC |
|---|---|---|
| UEF (Uniform Energy Factor) | 4 (better) | 3.8 |
| Energy use per year (kWh) | 1,240 (better) | 1,306 |
| First hour rating (gal) | 91 | 98 |
| Rated storage volume (gal) | 75 | 80 |
| Installed cost range | $4,026–$4,933 | $4,165–$4,780 |
| ENERGY STAR certified | yes | yes |
| Sound level (dB) | 49 | 37 (better) |
| Refrigerant | R-134a, GWP 1430 | R-744 (CO2), GWP 1 |
| On the market since | 2026-06-30 | 2026-06-01 |
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.
- Both are ENERGY STAR certified, which requires a manufacturer warranty of at least six years; the actual term for each model is not published.
- Time on the market, as filed with ENERGY STAR: the RINNAI REHP80W since 2026-06-30, the VAUGHN THERMAL MP80F-RC since 2026-06-01. A sale date, not a lifespan.
Which should you pick?
- Pick the RINNAI REHP80W if running cost matters most: it uses 65 kWh less a year on the same test.
- Pick the VAUGHN THERMAL MP80F-RC if you need more hot water in your busiest hour: it lists a first hour rating of 98 gallons against 91.
- Neither if your household's busiest hour needs more than 98 gallons of hot water — neither lists more. Check whether a 75-gallon heater is enough.
Each model on its own
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RINNAI REHP80W
Its filed figures, class position and running cost on your ZIP.
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VAUGHN THERMAL MP80F-RC
Its filed figures, class position and running cost on your ZIP.