| | 3 sections | 4 sections | 5 sections | 6 sections |
| Performance | | | | |
| Nominal heat output central heating operation @ 80/60°C kW (min-max) | 18-87 | 22-120 | 29-166 | 39-200 |
| Nominal heat output central heating operation @ 50/30°C kW (min-max) | 20-93 | 24-129 | 33-179 | 44-217 |
| Nominal input (Hi) (min-max) | 19-89 | 23-123 | 31-170 | 41-205 |
| Efficiency | | | | |
| SBEM seasonal efficiency GCV | 95.8% | 95.66% | 95.5% | 95.74% |
| Efficiency – full load 100% NCV | 97.4% | 97.5% | 97.5% | 97.6% |
| Efficiency – part load 30% NCV | 108.6% | 108.1% | 108.3% | 108.4% |
| Eco design useful efficiency @ 80/60°C (100% full load) GCV | 87.7% | 87.8% | 87.8% | 87.8% |
| Eco design useful efficiency @ 50/30°C (30% part load) GCV | 97.7% | 97.5% | 97.3% | 97.6% |
| Gas | | | | |
| Standard fuel | Natural gas | Natural gas | Natural gas | Natural gas |
| Optional fuel adjustment – see installation & service manual | LPG (propane) | LPG (propane) | LPG (propane) | LPG (propane) |
| Max gas consumption NG m3/h | 9.4 | 13 | 18 | 21.7 |
| Max gas consumption LPG m3/h | 3.6 | 4.8 | 7 | 8.4 |
| Min/max gas inlet pressure NG mbar | 17-25 | 17-25 | 17-25 | 17-25 |
| Min/max gas pressure LPG mbar | 37-50 | 37-50 | 37-50 | 37-50 |
| Gas connection size BSP inches | 1¼” male thread | 1¼” male thread | 1¼” male thread | 1½” male thread |
| Flame protection | Ionisation | Ionisation | Ionisation | Ionisation |
| Ignition | Electronic | Electronic | Electronic | Electronic |
| Flue (concentric connection supplied as standard) | | | | |
| Flue diameter mm I/D | 150 | 150 | 150 | 150 |
| Air inlet diameter mm I/D | 150 | 150 | 150 | 150 |
| Mass flue gas flow rate kg/h | 27-150 | 37-197 | 39-287 | 65-345 |
| Max counter pressure PA | 130 | 130 | 130 | 130 |
| Hydraulics | | | | |
| Water content litres | 12 | 16 | 20 | 24 |
| Hydraulic resistance @ 11°C ΔT mbar | 549 | 449 | 566 | 599 |
| Hydraulic resistance @ 20°C ΔT mbar | 165 | 135 | 170 | 180 |
| Nominal flow rate @11°C ΔT l/s | 1.89 | 2.61 | 3.61 | 4.33 |
| Nominal flow rate @ 20°C ΔT l/s | 1.04 | 1.43 | 1.98 | 2.38 |
| Minimum flow rate I/hr | 1120 | 1486 | 2142 | 2585 |
| Condensate connection | 32mm OD | 32mm OD | 32mm OD | 32mm OD |
| Connection size BSP | 1¼” male thread | 1¼” male thread | 1¼” male thread | 1½” male thread* |
| Standard operating temperature °C | 20-90 | 20-90 | 20-90 | 20-90 |
| Max operating temperature °C | 90 | 90 | 90 | 90 |
| Max water temperature °C | 110 | 110 | 110 | 110 |
| Max water operating pressure bar | 6 | 6 | 6 | 6 |
| Min water operating pressure bar | 0.8 | 0.8 | 0.8 | 0.8 |
| General | | | | |
| Dry weight kg | 115 | 135 | 165 | 188 |
| Dimension (WxHxD) | 1190 x 1368 x 450 | 1190 x 1368 x 450 | 1190 x 1368 x 450 | 1190 x 1368 x 450 |
| NOx (Dry, 0% 02) Mg/kWh | 56 | 49 | 44 | 52 |
| Noise levels dB(A) at 1 metre | Less than 59 | Less than 59 | Less than 59 | Less than 59 |
| Eco design sound power levels LWA indoors dB | 67 | 67 | 67 | 67 |
| Standby heat Loss | 0.21 | 0.21 | 0.21 | 0.21 |
| Electrical | | | | |
| Nominal power supply | 230v x 1Ph x 50hz | 230v x 1Ph x 50hz | 230v x 1Ph x 50hz | 230v x 1Ph x 50hz |
| Start current amps | 26-103 | 28-167 | 49-196 | 48-306 |
| Modulating input V dc | 0-10 | 0-10 | 0-10 | 0-10 |
| Fuse rating amps | 6.3 | 6.3 | 6.3 | 6.3 |
| Controls voltage | 24 (max 4va) | 24 (max 4va) | 24 (max 4va) | 24 (max 4va) |
| Insulation class IP | IPX1** | IPX1** | IPX1** | IPX1** |
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