ELIOS MGWH150IXNN vs Midea MGWH150IXNN: which uses less energy?

At the high draw pattern the ELIOS MGWH150IXNN and the Midea MGWH150IXNN 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	ELIOS MGWH150IXNN	Midea MGWH150IXNN
UEF (Uniform Energy Factor)	0.95	0.95
Energy use per year (therms)	178	178
Max flow (GPM)	4.1	4.2
Installed cost range	$2,358–$3,405	$2,358–$3,405
ENERGY STAR certified	yes	yes
On the market since	2026-01-28	2025-09-01

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 ELIOS MGWH150IXNN since 2026-01-28, the Midea MGWH150IXNN since 2025-09-01. A sale date, not a lifespan.

Which should you pick?

Pick the ELIOS MGWH150IXNN if its price or availability suits you — on energy the two are level.
Pick the Midea MGWH150IXNN if you run more fixtures at once: it lists 4.2 GPM against 4.1.
Neither if you need more than 4.2 GPM at the same time — neither unit lists more. Check how to size a tankless unit by GPM.

Each model on its own

ELIOS MGWH150IXNN

Its filed figures, class position and running cost on your ZIP.
Midea MGWH150IXNN

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