RINNAI US3-RSJ-15/190RDVN3-L4 vs STATE HPACO-45 1+AXST-50LBTTP 1: which uses less energy?

At the medium draw pattern the RINNAI US3-RSJ-15/190RDVN3-L4 uses 866 kWh a year and the STATE HPACO-45 1**+AXST-50LBTTP 1** 915 — 49 kWh (5%) less, about 488 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.

Filed and computed figures
Figure	RINNAI US3-RSJ-15/190RDVN3-L4	STATE HPACO-45 1+AXST-50LBTTP 1
UEF (Uniform Energy Factor)	3.75 (better)	3.55
Energy use per year (kWh)	866 (better)	915
First hour rating (gal)	71	72
Rated storage volume (gal)	46	48
Installed cost range	$3,057–$4,409	$3,099–$4,228
ENERGY STAR certified	yes	yes
Sound level (dB)	49	not filed
Refrigerant	R-134a, GWP 1430	R-744 (CO2), GWP 1
On the market since	2026-05-30	2026-02-13

DOE CCD · 2026-09-19

What it costs to run

RINNAI US3-RSJ-15/190RDVN3-L4 — 866 kWh a year STATE HPACO-45 1**+AXST-50LBTTP 1** — 915 kWh a year

RINNAI US3-RSJ-15/190RDVN3-L4 is 49 kWh a year lower than STATE HPACO-45 1**+AXST-50LBTTP 1**.

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 RINNAI US3-RSJ-15/190RDVN3-L4 since 2026-05-30, the STATE HPACO-45 1**+AXST-50LBTTP 1** since 2026-02-13. A sale date, not a lifespan.

Which should you pick?

Pick the RINNAI US3-RSJ-15/190RDVN3-L4 if running cost matters most: it uses 49 kWh less a year on the same test.
Pick the STATE HPACO-45 1**+AXST-50LBTTP 1** if you need more hot water in your busiest hour: it lists a first hour rating of 72 gallons against 71.
Neither if your household's busiest hour needs more than 72 gallons of hot water — neither lists more. Check whether a 50-gallon heater is enough.

Each model on its own

RINNAI US3-RSJ-15/190RDVN3-L4

Its filed figures, class position and running cost on your ZIP.
STATE HPACO-45 1**+AXST-50LBTTP 1**

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