DoesTheMath

LG APHWC501M vs Rheem PRO H65 T2 RH310BM: which uses less energy?

At the high draw pattern the LG APHWC501M uses 1,262 kWh a year and the Rheem PRO H65 T2 RH310BM 1,417 — 155 kWh (11%) less, about 1,551 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
LG APHWC501M Rheem PRO H65 T2 RH310BM
UEF (Uniform Energy Factor) 3.93 (better) 3.5
Energy use per year (kWh) 1,262 (better) 1,417
First hour rating (gal) 76 75
Rated storage volume (gal) 53 59
Installed cost range $3,304–$4,656 $3,449–$4,282
ENERGY STAR certified yes yes
Refrigerant R-134a, GWP 1430 R-134a, GWP 1430
On the market since 2024-03-01 2020-04-30
DOE CCD · 2026-09-19

What it costs to run

LG APHWC501M: 1,262 kWh a year Rheem PRO H65 T2 RH310BM: 1,417 kWh a year

LG APHWC501M — 1,262 kWh a year Rheem PRO H65 T2 RH310BM — 1,417 kWh a year

LG APHWC501M is 155 kWh a year lower than Rheem PRO H65 T2 RH310BM.

DOE CCD · 2026-09-19

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Enter your ZIP to price both units on the same rate where you live.

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 LG APHWC501M since 2024-03-01, the Rheem PRO H65 T2 RH310BM since 2020-04-30. A sale date, not a lifespan.

Which should you pick?

  • Pick the LG APHWC501M if running cost matters most: it uses 155 kWh less a year on the same test.
  • Pick the Rheem PRO H65 T2 RH310BM if it is the one you can get installed sooner or for less — on the filed figures it has no advantage over the LG APHWC501M.
  • Neither if your household's busiest hour needs more than 76 gallons of hot water — neither lists more. Check whether a 50-gallon heater is enough.

Each model on its own

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