AMERICAN HPTV-66 2** vs Reservoir N51: which uses less energy?
At the high draw pattern the Reservoir N51 uses 1,405 kWh a year and the AMERICAN HPTV-66 2** 1,550 — 145 kWh (9%) less, about 1,449 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 | AMERICAN HPTV-66 2** | Reservoir N51 |
|---|---|---|
| UEF (Uniform Energy Factor) | 3.2 | 3.53 (better) |
| Energy use per year (kWh) | 1,550 | 1,405 (better) |
| First hour rating (gal) | 76 | 75 |
| Rated storage volume (gal) | 68 | 47 |
| Installed cost range | $3,707–$4,067 | $3,064–$4,199 |
| ENERGY STAR certified | yes | not matched |
| Sound level (dB) | 45 | not filed |
| Refrigerant | R-513A, GWP 630 | not filed |
| On the market since | 2023-07-10 | not filed |
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 Reservoir N51 if running cost matters most: it uses 145 kWh less a year on the same test.
- Pick the AMERICAN HPTV-66 2** if you need more hot water in your busiest hour: it lists a first hour rating of 76 gallons against 75.
- Neither if your household's busiest hour needs more than 76 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 HPTV-66 2**
Its filed figures, class position and running cost on your ZIP.
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Reservoir N51
Its filed figures, class position and running cost on your ZIP.