ORBEK HW100 vs TURBRO WH-65K: which uses less energy?
At the low draw pattern the TURBRO WH-65K uses 93 therms a year and the ORBEK HW100 95 — 1 therms (1%) less, about 12 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 low draw pattern.
| Figure | ORBEK HW100 | TURBRO WH-65K |
|---|---|---|
| UEF (Uniform Energy Factor) | 0.81 | 0.82 (better) |
| Energy use per year (therms) | 95 | 93 (better) |
| Max flow (GPM) | 2.5 | 2.4 |
| Installed cost range | $1,698–$2,632 | $1,745–$2,687 |
| 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 TURBRO WH-65K if running cost matters most: it uses 1 therms less a year on the same test.
- Pick the ORBEK HW100 if you run more fixtures at once: it lists 2.5 GPM against 2.4.
- Neither if you need more than 2.5 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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ORBEK HW100
Its filed figures, class position and running cost on your ZIP.
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TURBRO WH-65K
Its filed figures, class position and running cost on your ZIP.