FRIEDRICH PROPH80 T0 RH120-M vs LOCHINVAR HPTA-66 2**: which uses less energy?

At the high draw pattern the LOCHINVAR HPTA-66 2** uses 1,292 kWh a year and the FRIEDRICH PROPH80 T0 RH120-M 1,434 — 142 kWh (10%) less, about 1,419 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 high draw pattern.

Filed and computed figures
Figure	FRIEDRICH PROPH80 T0 RH120-M	LOCHINVAR HPTA-66 2**
UEF (Uniform Energy Factor)	3.46	3.84 (better)
Energy use per year (kWh)	1,434	1,292 (better)
First hour rating (gal)	84	83
Rated storage volume (gal)	72	68
Installed cost range	$3,866–$4,365	$3,780–$4,707
ENERGY STAR certified	yes	yes
Refrigerant	R-134a, GWP 1430	R-134a, GWP 1430
On the market since	2024-03-01	2024-03-01

DOE CCD · 2026-09-19

What it costs to run

FRIEDRICH PROPH80 T0 RH120-M — 1,434 kWh a year LOCHINVAR HPTA-66 2** — 1,292 kWh a year

LOCHINVAR HPTA-66 2** is 142 kWh a year lower than FRIEDRICH PROPH80 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 PROPH80 T0 RH120-M since 2024-03-01, the LOCHINVAR HPTA-66 2** since 2024-03-01. A sale date, not a lifespan.

Which should you pick?

Pick the LOCHINVAR HPTA-66 2** if running cost matters most: it uses 142 kWh less a year on the same test.
Pick the FRIEDRICH PROPH80 T0 RH120-M if you need more hot water in your busiest hour: it lists a first hour rating of 84 gallons against 83.
Neither if your household's busiest hour needs more than 84 gallons of hot water — neither lists more. Check whether a 65-gallon heater is enough.

Each model on its own

FRIEDRICH PROPH80 T0 RH120-M

Its filed figures, class position and running cost on your ZIP.
LOCHINVAR HPTA-66 2**

Its filed figures, class position and running cost on your ZIP.