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15 01202 662500 | sales@hamworthy-heating.com | hamworthy-heating.com Boiler model Unit S2-40 S2-60 S2-70 S2-80 S2-100 S2-120 S2-150 Energy Building regulation seasonal efficiency gross % 95.75 96.13 95.50 95.50 96.02 95.95 95.75 ErP efficiency rating A A A N/A N/A N/A N/A Boiler output 50/30 °C kW 43.0 61.0 76.8 87.5 104.5 129.5 146.0 Boiler output 80/60 °C kW 40.0 56.4 69.9 79.8 95.7 119.5 134.0 Boiler input (gross) maximum kW 45.7 64.4 80.0 91.3 109.3 136.5 151.6 Boiler input (nett) maximum kW 41.2 58.0 72.1 82.3 98.5 123.0 137.9 Boiler output minimum 80/60 °C kW 8.3 11.5 17.1 17.1 19.0 23.9 26.8 Water System design flow rate @ 25°C ∆ T rise l/s 0.4 0.5 0.7 0.8 0.9 1.1 1.3 Water side pressure loss @ 25°C ∆ T rise mbar 205 224 176 205 246 314 380 System design flow rate @ 20°C ∆ T rise l/s 0.5 0.7 0.8 0.9 1.1 1.4 1.6 Water side pressure loss @ 20°C ∆ T rise mbar 320 350 275 320 385 490 580 System design flow rate @ 11°C ∆ T rise l/s 0.9 1.2 1.5 1.7 2.1 2.6 2.9 Water side pressure loss @ 11°C ∆ T rise mbar 1058 1157 909 1058 1273 1620 1700 Operating water pressure maximum (minimum) barg 4 (1.5) 4 (1.5) 4 (1.5) 4 (1.5) 4 (1.5) 4 (1.5) 4 (1.5) Maximum operating water temperature °C 85 85 85 85 85 85 85 Gas Gas flow rate natural gas (G20) - maximum m 3 /h 4.4 6.1 7.6 8.7 10.4 13.0 14.6 Gas inlet pressure natural gas (G20) - minimum/nominal/maximum mbar 17.5 min / 20.0 nom / 25.0 max Flue Approx. flue gas volume @ 15°C, 9.1-9.3% C0 2 , N.T.P m 3 /h 57 79 98 112 135 168 189 Flue gas temperature @80/60 °C °C 80 76 70 74 76 70 70 NO x emission (0% excess oxygen, dry air free) European Class 6 mg/kWh 36 35 35 35 34 36 35 Pressure at flue outlet Pa 156 200 123 179 187 200 200 Misc. Nominal supply voltage 230V 1Ph 50Hz Approx. shipping weight kg 50 60 90 90 95 100 125 Noise emissions/module @ 1m Max dB (A) 57.4 59.7 57.3 57.3 58.5 61.6 59.3 15 Technical data Boilers Data & Dimensions: Stratton mk2  541 B A 800 890 Return G 1¼" male Gas G 1" male Flow G 1¼" male 250 Front Side Underside Note: All dimensions in mm unless otherwise stated. Underside Front Side Dimensions Reference S2-40 S2-60 S2-70 S2-80 S2-100 S2-120 S2-150 Depth (mm) A 477 477 574 574 574 692 800 Top clearance B Top clearance is dependent on flue system choice – see full Stratton mk2 brochure DIMENSIONS

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