Lochinvar ENS-30 1 vs State ENJB-30 1: which uses less energy?

An asterisk in a model number stands for any character: one filing covers several variants.

At the low draw pattern the State ENJB-30 1** uses 2,494 kWh a year and the Lochinvar ENS-30 1** 2,522 — 28 kWh (1%) less, about 280 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 low draw pattern.

Filed and computed figures
Figure	Lochinvar ENS-30 1**	State ENJB-30 1**
UEF (Uniform Energy Factor)	0.89	0.9 (better)
Energy use per year (kWh)	2,522	2,494 (better)
First hour rating (gal)	47	47
Rated storage volume (gal)	27	26
Installed cost range	not published	not published
CPSC recall naming it CPSC	none on file	none on file

DOE CCD · 2026-09-19 CPSC · 2026-09-24

What it costs to run

Lochinvar ENS-30 1** 2,522 kWh a year
State ENJB-30 1** 2,494 kWh a year

State ENJB-30 1** is 28 kWh a year lower than Lochinvar ENS-30 1**.

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 above.
No CPSC recall on file names either model (list checked 2026-09-24).
The actual warranty term is printed in each model’s documentation, not in any registry.

Which should you pick?

Pick the State ENJB-30 1** if running cost matters most: it uses 28 kWh less a year on the same test.
Pick the Lochinvar ENS-30 1** if it is the one you can get installed sooner or for less — on the filed figures it has no advantage over the State ENJB-30 1**.
Neither if your household's busiest hour needs more than 47 gallons of hot water — neither lists more. Check whether a 30-gallon heater is enough.

Each model on its own

Lochinvar ENS-30 1** Filed figures, class position, running cost on your ZIP 2,522 kWh a year
State ENJB-30 1** Filed figures, class position, running cost on your ZIP 2,494 kWh a year