| Heat output (80-60°C) - maximum | Natural Gas (G20) | kW | 112.8 | 146.6 | 185.6 | 226.7 | 272.0 |
| Heat output (80-60°C) - minimum | Natural Gas (G20) | kW | 10.8 | 18.3 | 24.2 | 24.6 | 30.0 |
| Heat output (50-30°C) - maximum | Natural Gas (G20) | kW | 124.0 | 161.2 | 204.2 | 249.7 | 300.0 |
| Heat output (50-30°C) - minimum | Natural Gas (G20) | kW | 12.0 | 20.4 | 26.8 | 27.4 | 33.2 |
| Heat output (80-60°C) - maximum | LPG (G31) | kW | 112.8 | 146.5 | 185.6 | 226.7 | 273.8 |
| Heat output (80-60°C) - minimum | LPG (G31) | kW | 27.9 | 36.6 | 46.0 | 56.2 | 53.3 |
| Heat output (50-30°C) - maximum | LPG (G31) | kW | 122.0 | 158.4 | 204.2 | 244.5 | 295.1 |
| Heat output (50-30°C) - minimum | LPG (G31) | kW | 30.5 | 40.0 | 50.0 | 61.4 | 57.9 |
| Heat input - maximum | kW | 115.5 | 150.0 | 190.0 | 232.0 | 280.0 |
| Heat efficiency (80-60°C) - maximum | % | 107.5 | 107.7 | 107.1 |
| Heat efficiency (50-30°C) - maximum | % |
| Standby losses | kW | 0.215 | 0.225 | 0.248 | 0.260 | 0.285 |
| Modulation | 10:1 | 8:1 | 9:1 |
| Building regulations Part L seasonal efficiency (Non Domestic Building) | Natural Gas (G20) | % gross | 96.1 | 95.8 | 95.5 |
| Building regulations Part L seasonal efficiency (Non Domestic Building) | LPG (G31) | % gross | 98.2 | 97.9 | 97.7 |
| Hydraulic |
| Water content | litres | 51 | 47 | 66 | 62 | 75 |
| System design flow rate (20°C AT rise) single boiler | m³/hr | 5.50 | 7.20 | 9.00 | 11.1 | 11.22 |
| Water side pressure loss (20°C AT rise) single boiler | kPa | 8.0 | 8.8 | 10.1 | 10.8 | 13.2 |
| Water pressure - maximum | bar | 6.0 |
| Water pressure - minimum | bar | 0.8 |
| Flow temperature setting - maximum | °C | 90 |
| Gas |
| Gas flow rate - maximum | Natural Gas (G20) | m³/hr | 10.7 | 14.3 | 18.2 | 21.9 | 29.0 |
| Gas flow rate - minimum * | LPG (G31-37 mbar) | m³/hr | 4.5 | 5.9 | 7.4 | 9.0 | 11.5 |
| Gas inlet pressure - maximum | Natural Gas (G20) | mbar | 25 |
| Gas inlet pressure - maximum | LPG (G31-37 mbar) | mbar | 45 |
| Gas inlet pressure - nominal | Natural Gas (G20) | mbar | 20 |
| Gas inlet pressure - nominal | LPG (G31-37 mbar) | mbar | 37 |
| Gas inlet pressure - minimum | Natural Gas (G20) | mbar | 17 |
| Gas inlet pressure - minimum | LPG (G31-37 mbar) | mbar | 25 |
| Flue |
| Flue gas temperature (80/60°C) | °C | 60 | 61 | 62 | 61 | 62 |
| Flue gas temperature (50/30°C) | °C | 34 | 35 |
| Flue gas pressure - maximum | Pa | 200 |
| Mass flow rate of flue gasses | g/s | 47 | 64 | 80 | 101 | 120 |
| Condensate volume - maximum | kg/h | 14.4 | 18.6 | 24.0 | 30.0 | 36.0 |
| Dry NOx emission (0% excess O₂) | mg/kWh | 36.6 | 39.4 | 38.7 | 36.0 | 24.0 |
| Electric |
| Electrical supply | 230/1/50 |
| (Fused supply requirement of 3 Amps) |
| Power consumption - maximum | kW | 0.178 | 0.197 | 0.208 | 0.275 | 0.410 |
| Power consumption - minimum | kW | 0.022 | 0.030 | 0.028 | 0.030 | 0.034 |
| Run current - maximum | A | 0.9 | 1.0 | 1.1 | 1.4 | 1.8 |
| Other |
| Dry weight | kg | 185 | 199 | 224 | 236 | 283 |
