DoesTheMath

MARATHON MR40245 C vs Richmond PROPH40 T0 RH120: which uses less energy?

At the medium draw pattern the Richmond PROPH40 T0 RH120 uses 1,254 kWh a year and the MARATHON MR40245 C 3,531 — 2,277 kWh (64%) less, about 22,766 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
MARATHON MR40245 C Richmond PROPH40 T0 RH120
UEF (Uniform Energy Factor) 0.92 2.59 (better)
Energy use per year (kWh) 3,531 1,254 (better)
First hour rating (gal) 51 43
Rated storage volume (gal) 38 37
Installed cost range $1,620–$1,853 not published
ENERGY STAR certified not matched not matched
DOE CCD · 2026-09-19

What it costs to run

MARATHON MR40245 C: 3,531 kWh a year Richmond PROPH40 T0 RH120: 1,254 kWh a year

MARATHON MR40245 C — 3,531 kWh a year Richmond PROPH40 T0 RH120 — 1,254 kWh a year

Richmond PROPH40 T0 RH120 is 2,277 kWh a year lower than MARATHON MR40245 C.

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.
  • The actual warranty term is printed in each model’s documentation, not in any registry.

Which should you pick?

  • Pick the Richmond PROPH40 T0 RH120 if running cost matters most: it uses 2,277 kWh less a year on the same test.
  • Pick the MARATHON MR40245 C if you need more hot water in your busiest hour: it lists a first hour rating of 51 gallons against 43.
  • Neither if your household's busiest hour needs more than 51 gallons of hot water — neither lists more. Check whether a 40-gallon heater is enough.

Each model on its own

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