| Model | Type | Fuel | Efficiency |
|---|---|---|---|
|
|
|||
| Fer tech 18ov | Condensing | Gas | 89.4% |
| Fer tech 25ov | Condensing | Gas | 89.1% |
| Fer tech 31C | Condensing | Gas | 89.0% |
| Fer tech 38C | Condensing | Gas | 89.3% |
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