American HPTU-50N 1** vs John Wood HPACO-45 1**+AXST-50T 1**: which uses less energy?
An asterisk in a model number stands for any character: one filing covers several variants.
At the medium draw pattern the John Wood HPACO-45 1**+AXST-50T 1** uses 923 kWh a year and the American HPTU-50N 1** 942 — 19 kWh (2%) less, about 187 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 medium draw pattern.
| Figure | American HPTU-50N 1** | John Wood HPACO-45 1**+AXST-50T 1** |
|---|---|---|
| UEF (Uniform Energy Factor) | 3.45 | 3.52 (better) |
| Energy use per year (kWh) | 942 | 923 (better) |
| First hour rating (gal) | 66 | 67 |
| Rated storage volume (gal) | 46 | 45 |
| Installed cost range NLR REMDB | $3,022–$4,110 | $2,998–$4,170 |
| ENERGY STAR certified ENERGY STAR | yes | yes |
| Refrigerant ENERGY STAR | R-134a, GWP 1430 | R-744 (CO2), GWP 1 |
| On the market since ENERGY STAR | 2019-04-05 | 2026-02-13 |
| CPSC recall naming it CPSC | none on file | none on file |
DOE CCD · 2026-09-19 NLR REMDB · 2026-04-01 ENERGY STAR · 2026-09-19 CPSC · 2026-09-24
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 above.
- No CPSC recall on file names either model (list checked 2026-09-24).
- 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 American HPTU-50N 1** since 2019-04-05, the John Wood HPACO-45 1**+AXST-50T 1** since 2026-02-13. A sale date, not a lifespan.
Which should you pick?
- Pick the John Wood HPACO-45 1**+AXST-50T 1** if running cost matters most: it uses 19 kWh less a year on the same test.
- Pick the American HPTU-50N 1** if it is the one you can get installed sooner or for less — on the filed figures it has no advantage over the John Wood HPACO-45 1**+AXST-50T 1**.
- Neither if your household's busiest hour needs more than 67 gallons of hot water — neither lists more. Check whether a 40-gallon heater is enough.
Each model on its own
- American HPTU-50N 1** 942 kWh a year
- John Wood HPACO-45 1**+AXST-50T 1** 923 kWh a year