DoesTheMath

FRIEDRICH PROG50-38U RH60 EC1* vs Ruud PROG50S-40U RH60 EC1*: which uses less energy?

At the high draw pattern the FRIEDRICH PROG50-38U RH60 EC1* and the Ruud PROG50S-40U RH60 EC1* use the same energy, 269 therms a year each, on the same federal test. Both are filed as a gas tank, so the comparison holds; what separates them is below. Enter your ZIP to price either one on your own rate.

Side by side

Compared within one class only: models filed as a gas tank at the high draw pattern.

Filed and computed figures
FRIEDRICH PROG50-38U RH60 EC1* Ruud PROG50S-40U RH60 EC1*
UEF (Uniform Energy Factor) 0.63 0.63
Energy use per year (therms) 269 269
First hour rating (gal) 86 85
Rated storage volume (gal) 48 48
Installed cost range $1,732–$2,981 $1,732–$2,981
ENERGY STAR certified not matched not matched
DOE CCD · 2026-09-19

What it costs to run

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 FRIEDRICH PROG50-38U RH60 EC1* if its price or availability suits you — on energy the two are level.
  • Pick the Ruud PROG50S-40U RH60 EC1* if it is the one you can get installed sooner or for less — on the filed figures it has no advantage over the FRIEDRICH PROG50-38U RH60 EC1*.
  • Neither if your household's busiest hour needs more than 86 gallons of hot water — neither lists more. Check whether a 50-gallon heater is enough.

Each model on its own

Other comparisons

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