AMERICAN STANDARD WATER HEATERS ARIHPWH-65 vs RINNAI REHP65C: which uses less energy?

At the high draw pattern the RINNAI REHP65C uses 1,272 kWh a year and the AMERICAN STANDARD WATER HEATERS ARIHPWH-65 1,289 — 17 kWh (1%) less, about 165 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.

Filed and computed figures
Figure	AMERICAN STANDARD WATER HEATERS ARIHPWH-65	RINNAI REHP65C
UEF (Uniform Energy Factor)	3.85	3.9 (better)
Energy use per year (kWh)	1,289	1,272 (better)
First hour rating (gal)	78	80
Rated storage volume (gal)	62	60
Installed cost range	$3,587–$4,661	$3,528–$4,692
ENERGY STAR certified	yes	yes
Sound level (dB)	not filed	49
Refrigerant	R-134a, GWP 1430	R-134a, GWP 1430
On the market since	2023-10-30	2024-09-13

DOE CCD · 2026-09-19

What it costs to run

AMERICAN STANDARD WATER HEATERS ARIHPWH-65 — 1,289 kWh a year RINNAI REHP65C — 1,272 kWh a year

RINNAI REHP65C is 17 kWh a year lower than AMERICAN STANDARD WATER HEATERS ARIHPWH-65.

DOE CCD · 2026-09-19

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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 AMERICAN STANDARD WATER HEATERS ARIHPWH-65 since 2023-10-30, the RINNAI REHP65C since 2024-09-13. A sale date, not a lifespan.

Which should you pick?

Pick the RINNAI REHP65C if running cost matters most: it uses 17 kWh less a year on the same test.
Pick the AMERICAN STANDARD WATER HEATERS ARIHPWH-65 if it is the one you can get installed sooner or for less — on the filed figures it has no advantage over the RINNAI REHP65C.
Neither if your household's busiest hour needs more than 80 gallons of hot water — neither lists more. Check whether a 65-gallon heater is enough.

Each model on its own

AMERICAN STANDARD WATER HEATERS ARIHPWH-65

Its filed figures, class position and running cost on your ZIP.
RINNAI REHP65C

Its filed figures, class position and running cost on your ZIP.