Bosch TR4000C-10* vs EcoSmart ECOS 12: which uses less energy?
An asterisk in a model number stands for any character: one filing covers several variants.
At the very small draw pattern the Bosch TR4000C-10* and the EcoSmart ECOS 12 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 | Bosch TR4000C-10* | EcoSmart ECOS 12 |
|---|---|---|
| UEF (Uniform Energy Factor) | 0.95 | 0.95 |
| Energy use per year (kWh) | 622 | 622 |
| Max flow (GPM) | 1.1 | 1.2 |
| Installed cost range NLR REMDB | $1,303–$1,814 | $1,303–$1,814 |
| CPSC recall naming it CPSC | none on file | none on file |
DOE CCD · 2026-09-19 NLR REMDB · 2026-04-01 CPSC · 2026-09-24
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 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 EcoSmart ECOS 12 if you run more fixtures at once: it lists 1.2 GPM against 1.1.
- 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
- Bosch TR4000C-10* 622 kWh a year
- EcoSmart ECOS 12 622 kWh a year