STATE ATM-199M-N 1** vs VESTA VXP 9: which uses less energy?

At the high draw pattern the VESTA VXP 9 uses 176 therms a year and the STATE ATM-199M-N 1** 178 — 2 therms (1%) less, about 19 therms over ten years. Both are filed as a gas tankless unit, so the comparison holds. Enter your ZIP below to price the difference.

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	STATE ATM-199M-N 1**	VESTA VXP 9
UEF (Uniform Energy Factor)	0.95	0.96 (better)
Energy use per year (therms)	178	176 (better)
Max flow (GPM)	6	6
Installed cost range	$2,358–$3,405	$2,405–$3,460
ENERGY STAR certified	yes	yes
On the market since	2025-05-15	2025-10-01

DOE CCD · 2026-09-19

What it costs to run

STATE ATM-199M-N 1** — 178 therms a year VESTA VXP 9 — 176 therms a year

VESTA VXP 9 is 2 therms a year lower than STATE ATM-199M-N 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 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 STATE ATM-199M-N 1** since 2025-05-15, the VESTA VXP 9 since 2025-10-01. A sale date, not a lifespan.

Which should you pick?

Pick the VESTA VXP 9 if running cost matters most: it uses 2 therms less a year on the same test.
Pick the STATE ATM-199M-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 VESTA VXP 9.
Neither if you need more than 6 GPM at the same time — neither unit lists more. Check how to size a tankless unit by GPM.

Each model on its own

STATE ATM-199M-N 1**

Its filed figures, class position and running cost on your ZIP.
VESTA VXP 9

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