DoesTheMath

Rheem PRO H80 T2 RH310BM vs Ruud PROPH80 T0 RH120-M: which uses less energy?

At the high draw pattern the Rheem PRO H80 T2 RH310BM uses 1,417 kWh a year and the Ruud PROPH80 T0 RH120-M 1,434 — 16 kWh (1%) less, about 164 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
Rheem PRO H80 T2 RH310BM Ruud PROPH80 T0 RH120-M
UEF (Uniform Energy Factor) 3.5 (better) 3.46
Energy use per year (kWh) 1,417 (better) 1,434
First hour rating (gal) 87 84
Rated storage volume (gal) 72 72
Installed cost range $3,871–$4,405 $3,866–$4,365
ENERGY STAR certified yes yes
Refrigerant R-134a, GWP 1430 R-134a, GWP 1430
On the market since 2020-04-30 2024-03-01
DOE CCD · 2026-09-19

What it costs to run

Rheem PRO H80 T2 RH310BM: 1,417 kWh a year Ruud PROPH80 T0 RH120-M: 1,434 kWh a year

Rheem PRO H80 T2 RH310BM — 1,417 kWh a year Ruud PROPH80 T0 RH120-M — 1,434 kWh a year

Rheem PRO H80 T2 RH310BM is 17 kWh a year lower than Ruud PROPH80 T0 RH120-M.

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 Rheem PRO H80 T2 RH310BM since 2020-04-30, the Ruud PROPH80 T0 RH120-M since 2024-03-01. A sale date, not a lifespan.

Which should you pick?

  • Pick the Rheem PRO H80 T2 RH310BM if running cost matters most: it uses 16 kWh less a year on the same test.
  • Pick the Ruud PROPH80 T0 RH120-M if it is the one you can get installed sooner or for less — on the filed figures it has no advantage over the Rheem PRO H80 T2 RH310BM.
  • 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

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