3 TECHNICAL DATA 3.1 TECHNICAL PERFORMANCE DATA - NATURAL GAS (Cat I2H 2H - G20 20 mbar) 3.2 TECHNICAL PERFORMANCE DATA - LPG - PROPANE GAS (Cat I3P 3P - G31 37 mbar) Note: OtherTechnical data is the same as NG data. Alpha E-Tec 28 and 33 - Technical Data 5 E-Tec 28 E-Tec 33 Heat input gross - DHW kW 32.0 36.2 Heat input gross - CH kW 27.3 31.7 Heat input net - DHW kW 28.8 32.6 Heat input net - CH kW 24.6 28.6 Heat output condensing (50/30°C) - CH kW 26.1 29.7 Heat output non condensing (80/60°C) CH kW 24.1 28 Heat output min. - CH kW 4.3 4.9 Heat output nominal - DHW kW 28.3 32 Gas rate at max. output m³/h 3.05 3.45 Gas supply pressure mbar 20 20 Max.
CH temperature - Set point °C 85 85 Gas burner injector diameter mm 5.00 6.00 DHW flow rate at 35°C rise l/min 12.1 14.1 DHW flow rate at 30°C rise - EN13203-1 l/min 14.1 16.5 Dry NOx weight (net calorific value) mg/kWh 35 30 Dry NOx ppm 20 17 NOx Class 6 6 Factory set CO 2 CO at maximum CH output % 2 9.7 9.5 CO at maximum DHW output % 2 9.7 (+0.5/-0.2%) 9.5 (±0.2%) CO at minimum output % 2 8.8 (+0.2/-0.3%) 8.6 (+0.2/-0.3%) CO (max) ppm 450 450 Maximum CO/CO Ratio 2 0.004 0.004 SAP/SEDBUK seasonality efficiency 2005 % 90.1 90.2 SAP/SEDBUK seasonality efficiency 2009 % 88.9 89.0 ErP DHW efficiency % 87 (XL) 87 (XL) ErP Seasonal space heating efficiency % 93 93 Max.
primary system pressure bar (MPa) 2.5 (0.25) 2.5 (0.25) Min. primary system pressure bar (MPa) 0.5 (0.05) 0.5 (0.05) Recommended system pressure - Cold bar (MPa) 1.0 (0.1) 1.0 (0.1) System pressure relief valve setting bar (MPa) 3.0 (0.3) 3.0 (0.3) Expansion vessel size litres 8.0 8.0 Expansion vessel charge pressure bar (MPa) 1.0 (0.1) 1.0 (0.1) Electrical power consumption - Max. Watts 80 105 Electrical power consumption - Standby Watts 2 2 Max. temperature of combustion products °C 75 75 Max.
flue overheating temperature °C 120 120 Ambient operating temperature °C -5 to +50 -5 to +50 Category II 2H3P II 2H3P Type of installation C13, C33, C43, C53, C63, C83, C93 E-Tec 28 E-Tec 33 Heat input gross - DHW kW 31.3 35.4 Heat input gross - CH kW 26.7 31.1 Gas supply pressure mbar 37 37 Gas burner injector mm 3.80 4.30 CO at maximum CH output % 2 11.4 11.2 CO at maximum DHW output % 2 11.4 (+0.1/-0.3) 11.2 (+0.2/-0.4) CO at minimum output % 2 10.6 (+0.3/-0.1) 10.0 (+0.4/-0.2) Gas rate at maximum output kg/h (g/s) 2.24 (0.62) 2.53 (0.7)