| Model | Type | Fuel | Efficiency |
|---|---|---|---|
|
|
|||
| Protherm 100EC | Non-Condensing | Gas | 79.3% |
| Protherm 80 E | Non-Condensing | Gas | 78.7% |
| Protherm 80 EC | Non-Condensing | Gas | 78.7% |
| Protherm Protherm 40-50 CI | Non-Condensing | Gas | 78.9% |
| Protherm Protherm 60-80 CI | Non-Condensing | Gas | 78.3% |
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