DoesTheMath

FRIEDRICH PROE40 M2 RH95 vs STATE ENJB-40 1**: which uses less energy?

At the medium draw pattern the STATE ENJB-40 1** uses 3,456 kWh a year and the FRIEDRICH PROE40 M2 RH95 3,493 — 37 kWh (1%) less, about 372 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 PROE40 M2 RH95 STATE ENJB-40 1**
UEF (Uniform Energy Factor) 0.93 0.94 (better)
Energy use per year (kWh) 3,493 3,456 (better)
First hour rating (gal) 55 57
Rated storage volume (gal) 36 35
Installed cost range $1,597–$2,019 $1,589–$2,210
ENERGY STAR certified not matched not matched
DOE CCD · 2026-09-19

What it costs to run

FRIEDRICH PROE40 M2 RH95: 3,493 kWh a year STATE ENJB-40 1**: 3,456 kWh a year

FRIEDRICH PROE40 M2 RH95 — 3,493 kWh a year STATE ENJB-40 1** — 3,456 kWh a year

STATE ENJB-40 1** is 37 kWh a year lower than FRIEDRICH PROE40 M2 RH95.

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

Which should you pick?

  • Pick the STATE ENJB-40 1** if running cost matters most: it uses 37 kWh less a year on the same test.
  • Pick the FRIEDRICH PROE40 M2 RH95 if it is the one you can get installed sooner or for less — on the filed figures it has no advantage over the STATE ENJB-40 1**.
  • Neither if your household's busiest hour needs more than 57 gallons of hot water — neither lists more. Check whether a 30-gallon heater is enough.

Each model on its own

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