ARISTON ARIHPWH-80 vs Ruud PROPH80 T2 RH400-30: which uses less energy?

At the high draw pattern the Ruud PROPH80 T2 RH400-30 uses 1,219 kWh a year and the ARISTON ARIHPWH-80 1,237 — 18 kWh (1%) less, about 182 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	ARISTON ARIHPWH-80	Ruud PROPH80 T2 RH400-30
UEF (Uniform Energy Factor)	4.01	4.07 (better)
Energy use per year (kWh)	1,237	1,219 (better)
First hour rating (gal)	87	87
Rated storage volume (gal)	73	72
Installed cost range	$3,962–$4,924	$3,936–$4,975
ENERGY STAR certified	yes	yes
Refrigerant	R-134a, GWP 1430	R-134a, GWP 1430
On the market since	2024-12-13	2024-06-24

DOE CCD · 2026-09-19

What it costs to run

ARISTON ARIHPWH-80 — 1,237 kWh a year Ruud PROPH80 T2 RH400-30 — 1,219 kWh a year

Ruud PROPH80 T2 RH400-30 is 18 kWh a year lower than ARISTON ARIHPWH-80.

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 ARISTON ARIHPWH-80 since 2024-12-13, the Ruud PROPH80 T2 RH400-30 since 2024-06-24. A sale date, not a lifespan.

Which should you pick?

Pick the Ruud PROPH80 T2 RH400-30 if running cost matters most: it uses 18 kWh less a year on the same test.
Pick the ARISTON ARIHPWH-80 if it is the one you can get installed sooner or for less — on the filed figures it has no advantage over the Ruud PROPH80 T2 RH400-30.
Neither if your household's busiest hour needs more than 87 gallons of hot water — neither lists more. Check whether a 75-gallon heater is enough.

Each model on its own

ARISTON ARIHPWH-80

Its filed figures, class position and running cost on your ZIP.
Ruud PROPH80 T2 RH400-30

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