RELIANCE WATER HEATERS ATM-160M-N 1 vs STATE T-H3J-OS-N 1: which uses less energy?

At the high draw pattern the RELIANCE WATER HEATERS ATM-160M-N 1** and the STATE T-H3J-OS-N 1** use the same energy, 178 therms a year each, on the same federal test. Both are filed as a gas tankless unit, so the comparison holds; what separates them is below. Enter your ZIP to price either one on your own rate.

Side by side

Compared within one class only: models filed as a gas tankless unit at the high draw pattern.

Filed and computed figures
Figure	RELIANCE WATER HEATERS ATM-160M-N 1**	STATE T-H3J-OS-N 1**
UEF (Uniform Energy Factor)	0.95	0.95
Energy use per year (therms)	178	178
Max flow (GPM)	4.8	4.7
Installed cost range	$2,358–$3,405	$2,358–$3,405
ENERGY STAR certified	yes	yes
On the market since	2025-05-15	2012-08-01

DOE CCD · 2026-09-19

What it costs to run

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 RELIANCE WATER HEATERS ATM-160M-N 1** since 2025-05-15, the STATE T-H3J-OS-N 1** since 2012-08-01. A sale date, not a lifespan.

Which should you pick?

Pick the RELIANCE WATER HEATERS ATM-160M-N 1** if its price or availability suits you — on energy the two are level.
Pick the STATE T-H3J-OS-N 1** if it is the one you can get installed sooner or for less — on the filed figures it has no advantage over the RELIANCE WATER HEATERS ATM-160M-N 1**.
Neither if you need more than 4.8 GPM at the same time — neither unit lists more. Check how to size a tankless unit by GPM.

Each model on its own

RELIANCE WATER HEATERS ATM-160M-N 1**

Its filed figures, class position and running cost on your ZIP.
STATE T-H3J-OS-N 1**

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