Bosch US3-RSJ-15/250RDVN3-L3 vs GIANT HPACO-45 1+AXST-66 1: which uses less energy?

At the high draw pattern the Bosch US3-RSJ-15/250RDVN3-L3 uses 1,272 kWh a year and the GIANT HPACO-45 1**+AXST-66 1** 1,341 — 69 kWh (5%) less, about 688 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	Bosch US3-RSJ-15/250RDVN3-L3	GIANT HPACO-45 1+AXST-66 1
UEF (Uniform Energy Factor)	3.9 (better)	3.7
Energy use per year (kWh)	1,272 (better)	1,341
First hour rating (gal)	80	82
Rated storage volume (gal)	60	60
Installed cost range	$3,528–$4,692	$3,505–$4,492
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	2024-10-15	2026-02-13

DOE CCD · 2026-09-19

What it costs to run

Bosch US3-RSJ-15/250RDVN3-L3 — 1,272 kWh a year GIANT HPACO-45 1**+AXST-66 1** — 1,341 kWh a year

Bosch US3-RSJ-15/250RDVN3-L3 is 69 kWh a year lower than GIANT HPACO-45 1**+AXST-66 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 Bosch US3-RSJ-15/250RDVN3-L3 since 2024-10-15, the GIANT HPACO-45 1**+AXST-66 1** since 2026-02-13. A sale date, not a lifespan.

Which should you pick?

Pick the Bosch US3-RSJ-15/250RDVN3-L3 if running cost matters most: it uses 69 kWh less a year on the same test.
Pick the GIANT HPACO-45 1**+AXST-66 1** if you need more hot water in your busiest hour: it lists a first hour rating of 82 gallons against 80.
Neither if your household's busiest hour needs more than 82 gallons of hot water — neither lists more. Check whether a 65-gallon heater is enough.

Each model on its own

Bosch US3-RSJ-15/250RDVN3-L3

Its filed figures, class position and running cost on your ZIP.
GIANT HPACO-45 1**+AXST-66 1**

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