DoesTheMath

LOCHINVAR HPTA-40 2** vs Rheem PROE40 M2 RH95: which uses less energy?

At the medium draw pattern the LOCHINVAR HPTA-40 2** uses 902 kWh a year and the Rheem PROE40 M2 RH95 3,493 — 2,590 kWh (74%) less, about 25,904 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
LOCHINVAR HPTA-40 2** Rheem PROE40 M2 RH95
UEF (Uniform Energy Factor) 3.6 (better) 0.93
Energy use per year (kWh) 902 (better) 3,493
First hour rating (gal) 55 55
Rated storage volume (gal) 36 36
Installed cost range not published $1,597–$2,019
ENERGY STAR certified yes not matched
Refrigerant R-134a, GWP 1430 not filed
On the market since 2024-03-01 not filed
DOE CCD · 2026-09-19

What it costs to run

LOCHINVAR HPTA-40 2**: 902 kWh a year Rheem PROE40 M2 RH95: 3,493 kWh a year

LOCHINVAR HPTA-40 2** — 902 kWh a year Rheem PROE40 M2 RH95 — 3,493 kWh a year

LOCHINVAR HPTA-40 2** is 2,591 kWh a year lower than Rheem PROE40 M2 RH95.

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

Which should you pick?

  • Pick the LOCHINVAR HPTA-40 2** if running cost matters most: it uses 2,590 kWh less a year on the same test.
  • Pick the Rheem 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 LOCHINVAR HPTA-40 2**.
  • 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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