DoesTheMath

AMERICAN FPTU-66 1** vs LOCHINVAR HPTV-66 2**: which uses less energy?

At the high draw pattern the AMERICAN FPTU-66 1** uses 1,451 kWh a year and the LOCHINVAR HPTV-66 2** 1,550 — 100 kWh (6%) less, about 997 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
AMERICAN FPTU-66 1** LOCHINVAR HPTV-66 2**
UEF (Uniform Energy Factor) 3.42 (better) 3.2
Energy use per year (kWh) 1,451 (better) 1,550
First hour rating (gal) 79 76
Rated storage volume (gal) 67 68
Installed cost range $3,699–$4,278 $3,707–$4,067
ENERGY STAR certified yes yes
Sound level (dB) not filed 45
Refrigerant R-134a, GWP 1430 R-513A, GWP 630
On the market since 2019-04-05 2023-07-10
DOE CCD · 2026-09-19

What it costs to run

AMERICAN FPTU-66 1**: 1,451 kWh a year LOCHINVAR HPTV-66 2**: 1,550 kWh a year

AMERICAN FPTU-66 1** — 1,451 kWh a year LOCHINVAR HPTV-66 2** — 1,550 kWh a year

AMERICAN FPTU-66 1** is 99 kWh a year lower than LOCHINVAR HPTV-66 2**.

DOE CCD · 2026-09-19

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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.
  • 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 AMERICAN FPTU-66 1** since 2019-04-05, the LOCHINVAR HPTV-66 2** since 2023-07-10. A sale date, not a lifespan.

Which should you pick?

  • Pick the AMERICAN FPTU-66 1** if running cost matters most: it uses 100 kWh less a year on the same test.
  • Pick the LOCHINVAR HPTV-66 2** if it is the one you can get installed sooner or for less — on the filed figures it has no advantage over the AMERICAN FPTU-66 1**.
  • Neither if your household's busiest hour needs more than 79 gallons of hot water — neither lists more. Check whether a 65-gallon heater is enough.

Each model on its own

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