| Model | Type | Fuel | Efficiency |
|---|---|---|---|
|
|
|||
| Elco Straton 22 | Non-Condensing | Oil | 85.6% |
| Elco Systron 2-22 | Non-Condensing | Oil | 85.6% |
| Elco THISION S PLUS 34 | Condensing | Gas | 89.4% |
| Elco THISION S PLUS 46 | Condensing | Gas | 89.5% |
| Elco THISION S PLUS 54 | Condensing | Gas | 89.5% |
| Elco Trigon 22 | Condensing | Gas | 88.8% |
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