DoesTheMath

FRIEDRICH PROPH65 T0 RH120-M vs VAUGHN THERMAL MP55FHPT: which uses less energy?

At the medium draw pattern the VAUGHN THERMAL MP55FHPT uses 984 kWh a year and the FRIEDRICH PROPH65 T0 RH120-M 1,041 — 57 kWh (5%) less, about 568 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
FRIEDRICH PROPH65 T0 RH120-M VAUGHN THERMAL MP55FHPT
UEF (Uniform Energy Factor) 3.12 3.3 (better)
Energy use per year (kWh) 1,041 984 (better)
First hour rating (gal) 63 62
Rated storage volume (gal) 59 55
Installed cost range $3,406–$3,902 $3,297–$4,045
ENERGY STAR certified yes yes
Sound level (dB) not filed 54
Refrigerant R-134a, GWP 1430 R-134a, GWP 1430
On the market since 2022-04-21 2025-06-01
DOE CCD · 2026-09-19

What it costs to run

FRIEDRICH PROPH65 T0 RH120-M: 1,041 kWh a year VAUGHN THERMAL MP55FHPT: 984 kWh a year

FRIEDRICH PROPH65 T0 RH120-M — 1,041 kWh a year VAUGHN THERMAL MP55FHPT — 984 kWh a year

VAUGHN THERMAL MP55FHPT is 57 kWh a year lower than FRIEDRICH PROPH65 T0 RH120-M.

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 FRIEDRICH PROPH65 T0 RH120-M since 2022-04-21, the VAUGHN THERMAL MP55FHPT since 2025-06-01. A sale date, not a lifespan.

Which should you pick?

  • Pick the VAUGHN THERMAL MP55FHPT if running cost matters most: it uses 57 kWh less a year on the same test.
  • Pick the FRIEDRICH PROPH65 T0 RH120-M if you need more hot water in your busiest hour: it lists a first hour rating of 63 gallons against 62.
  • Neither if your household's busiest hour needs more than 63 gallons of hot water — neither lists more. Check whether a 50-gallon heater is enough.

Each model on its own

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