LOCHINVAR HPTS-50 2 vs RELIANCE WATER HEATERS HPTA-50 2: which uses less energy?

At the medium draw pattern the LOCHINVAR HPTS-50 2** uses 855 kWh a year and the RELIANCE WATER HEATERS HPTA-50 2** 883 — 28 kWh (3%) less, about 279 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
Figure	LOCHINVAR HPTS-50 2**	RELIANCE WATER HEATERS HPTA-50 2**
UEF (Uniform Energy Factor)	3.8 (better)	3.68
Energy use per year (kWh)	855 (better)	883
First hour rating (gal)	65	65
Rated storage volume (gal)	46	46
Installed cost range	$3,062–$4,459	$3,049–$4,340
ENERGY STAR certified	yes	yes
Refrigerant	R-134a, GWP 1430	R-134a, GWP 1430
On the market since	2022-06-06	2024-03-01

DOE CCD · 2026-09-19

What it costs to run

LOCHINVAR HPTS-50 2** — 855 kWh a year RELIANCE WATER HEATERS HPTA-50 2** — 883 kWh a year

LOCHINVAR HPTS-50 2** is 28 kWh a year lower than RELIANCE WATER HEATERS HPTA-50 2**.

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 LOCHINVAR HPTS-50 2** since 2022-06-06, the RELIANCE WATER HEATERS HPTA-50 2** since 2024-03-01. A sale date, not a lifespan.

Which should you pick?

Pick the LOCHINVAR HPTS-50 2** if running cost matters most: it uses 28 kWh less a year on the same test.
Pick the RELIANCE WATER HEATERS HPTA-50 2** if it is the one you can get installed sooner or for less — on the filed figures it has no advantage over the LOCHINVAR HPTS-50 2**.
Neither if your household's busiest hour needs more than 65 gallons of hot water — neither lists more. Check whether a 50-gallon heater is enough.

Each model on its own

LOCHINVAR HPTS-50 2**

Its filed figures, class position and running cost on your ZIP.
RELIANCE WATER HEATERS HPTA-50 2**

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