DoesTheMath

AMERICAN STANDARD WATER HEATERS ENS50L-* vs FRIEDRICH PROE38 S2 RH93 SB-LO: which uses less energy?

At the low draw pattern the AMERICAN STANDARD WATER HEATERS ENS50L-* uses 2,362 kWh a year and the FRIEDRICH PROE38 S2 RH93 SB-LO 2,413 — 51 kWh (2%) less, about 508 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 low draw pattern.

Filed and computed figures
AMERICAN STANDARD WATER HEATERS ENS50L-* FRIEDRICH PROE38 S2 RH93 SB-LO
UEF (Uniform Energy Factor) 0.95 (better) 0.93
Energy use per year (kWh) 2,362 (better) 2,413
First hour rating (gal) 55 42
Rated storage volume (gal) 41 35
Installed cost range $1,683–$2,577 $1,583–$1,994
ENERGY STAR certified not matched not matched
DOE CCD · 2026-09-19

What it costs to run

AMERICAN STANDARD WATER HEATERS ENS50L-*: 2,362 kWh a year FRIEDRICH PROE38 S2 RH93 SB-LO: 2,413 kWh a year

AMERICAN STANDARD WATER HEATERS ENS50L-* — 2,362 kWh a year FRIEDRICH PROE38 S2 RH93 SB-LO — 2,413 kWh a year

AMERICAN STANDARD WATER HEATERS ENS50L-* is 51 kWh a year lower than FRIEDRICH PROE38 S2 RH93 SB-LO.

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 AMERICAN STANDARD WATER HEATERS ENS50L-* if running cost matters most: it uses 51 kWh less a year on the same test.
  • Pick the FRIEDRICH PROE38 S2 RH93 SB-LO if the installed price matters more than the running cost: its modeled installed range is $1,583–$1,994 against $1,683–$2,577.
  • Neither if your household's busiest hour needs more than 55 gallons of hot water — neither lists more. Check whether a 40-gallon heater is enough.

Each model on its own

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