ECOSMART ECOS 12 vs Rheem SPEX012240T: which uses less energy?
At the very small draw pattern the ECOSMART ECOS 12 and the Rheem SPEX012240T use the same energy, 622 kWh a year each, on the same federal test. Both are filed as an electric 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 an electric tankless unit at the very small draw pattern.
| Figure | ECOSMART ECOS 12 | Rheem SPEX012240T |
|---|---|---|
| UEF (Uniform Energy Factor) | 0.95 | 0.95 |
| Energy use per year (kWh) | 622 | 622 |
| Max flow (GPM) | 1.2 | 1.1 |
| Installed cost range | $1,303–$1,814 | $1,303–$1,814 |
| ENERGY STAR certified | not matched | not matched |
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.
- The actual warranty term is printed in each model’s documentation, not in any registry.
Which should you pick?
- Pick the ECOSMART ECOS 12 if its price or availability suits you — on energy the two are level.
- Pick the Rheem SPEX012240T if it is the one you can get installed sooner or for less — on the filed figures it has no advantage over the ECOSMART ECOS 12.
- Neither if you need more than 1.2 GPM at the same time — neither unit lists more. Check how to size a tankless unit by GPM.
Each model on its own
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ECOSMART ECOS 12
Its filed figures, class position and running cost on your ZIP.
-
Rheem SPEX012240T
Its filed figures, class position and running cost on your ZIP.