48 Boiler model Unit ELT440 ELT510 ELT580 Energy Building regulation seasonal efficiency gross % 85.07 85.11 84.97 Boiler output 80/60 °C kW 440 510 580 Boiler input (gross) maximum kW 537 622 707 Boiler input (net) maximum kW 483 560 637 Boiler output minimum 80/60 °C kW 100 100 165 Water Design flow rate @ 20°C ∆T rise l/s 5.26 6.1 6.94 Water side pressure loss @ 20°C ∆T rise mbar 20 27 35 Design flow rate @ 10°C ∆T rise l/s 10.53 12.2 13.88 Water side pressure loss @ 10°C ∆T rise mbar 81 108 140 Water flow rate - minimum l/s No minimum flow rate Water pressure - maximum (minimum) barg 4 (0.5) 4 (0.5) 4 (0.5) Operating water temperature - maximum (minimum) °C 90 (60) 90 (60) 90 (60) Water return temperature - minimum °C 15 15 15 Gas Gas flow rate natural gas (G20) - maximum m 3 /h 51.2 59.3 67.4 Gas inlet pressure natural gas (G20) - nominal (maximum) mbar 20 (50) 20 (50) 20 (50) Flue Approx. flue gas volume @ 15°C, 9% C0 2 , N.T.P m 3 /h 614.9 707.1 830.1 Flue gas temperature @80/60 °C °C 182 192 197 NOX emission (0% excess oxygen, dry air free) European Class 5 mg/kWh 80-100 80-100 80-100 Combustion chamber resistance mbar 2.53 3.83 5.86 Misc. Nominal supply voltage - for boiler 230V 1Ph 50Hz Approx. shipping weight - excluding burner kg 973 976 980 Ensbury boiler Technical data BOILERS
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