| Model | Type | Fuel | Efficiency |
|---|---|---|---|
|
|
|||
| Optia FF100 | Non-Condensing | Gas | 78.0% |
| Optia FF30 | Non-Condensing | Gas | 79.4% |
| Optia FF40 | Non-Condensing | Gas | 78.6% |
| Optia FF50 | Non-Condensing | Gas | 79.6% |
| Optia FF60 | Non-Condensing | Gas | 78.3% |
| Optia FF70 | Non-Condensing | Gas | 78.5% |
| Optia FF80 | Non-Condensing | Gas | 78.1% |
| Optia HE 12 | Condensing | Gas | 86.6% |
| Optia HE 15 | Condensing | Gas | 85.9% |
| Optia HE 18 | Condensing | Gas | 86.6% |
| Optia HE 9 | Condensing | Gas | 86.4% |
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