LOCHINVAR T-H3M-OS-N 1** vs RINNAI (RX130I) REU-NB2024FF-US: which uses less energy?
At the medium draw pattern the RINNAI (RX130I) REU-NB2024FF-US uses 114 therms a year and the LOCHINVAR T-H3M-OS-N 1** 122 — 8 therms (6%) less, about 75 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 medium draw pattern.
| Figure | LOCHINVAR T-H3M-OS-N 1** | RINNAI (RX130I) REU-NB2024FF-US |
|---|---|---|
| UEF (Uniform Energy Factor) | 0.91 | 0.97 (better) |
| Energy use per year (therms) | 122 | 114 (better) |
| Max flow (GPM) | 3.5 | 3.8 |
| Installed cost range | $2,169–$3,184 | $2,452–$3,515 |
| ENERGY STAR certified | not matched | yes |
| On the market since | not filed | 2024-03-01 |
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 RINNAI (RX130I) REU-NB2024FF-US if running cost matters most: it uses 8 therms less a year on the same test.
- Pick the LOCHINVAR T-H3M-OS-N 1** if the installed price matters more than the running cost: its modeled installed range is $2,169–$3,184 against $2,452–$3,515.
- Neither if you need more than 3.8 GPM at the same time — neither unit lists more. Check how to size a tankless unit by GPM.
Each model on its own
-
LOCHINVAR T-H3M-OS-N 1**
Its filed figures, class position and running cost on your ZIP.
-
RINNAI (RX130I) REU-NB2024FF-US
Its filed figures, class position and running cost on your ZIP.