Heating efficiency class A; Domestic hot water efficiency class A; Domestic hot water load profile XL; Reduced heat output - nominal (80/60°C) 7.5 - 24.0 KW; Reduced heat output - nominal (60/40°C) 7.9 - 25.4 KW; Reduced heat output - nominal (50/30°C) 8.3 - 26.1 KW; Reduced heat output - nominal (40/30°C) 8.4 - 26.8 KW; Nominal heat output in domestic hot water 28 KW; Nominal heat input in domestic hot water 28.6 KW; Reduced heat input - nominal in heating 7.8 - 24.8 KW; Nominal efficiency (80/60°C) 97%; Nominal efficiency (60/40°C) 102.4%; Nominal efficiency (50/30°C) 105.4%; Nominal efficiency (40/30°C) 107.9%; Efficiency at 30% 107.8%; Heat loss in the casing (ΔT = 50K) 0.2%; Chimney losses with burner on (80/60°C) Min-Max 0.5 - 1.5%; Chimney losses with burner off <0.1%; Consumption at nominal power Methane 1.93 KG/Hm; Methane flue gas temperature (80/60°C) °C 84; Methane flue gas temperature (40/30°C) °C 41; Methane flue gas mass flow rate (80/60°C) g/s 13.6; Methane flue gas mass flow rate (40/30°C) g/s 3.8; Excess air Methane - 1.25; NOx content Methane mg/kWh 28.8; CO content Methane (dry fumes) mg/kWh 131; CO2 content; Methane (dry fumes) % 9.2; NOx class - 5; Maximum condensate quantity (pH, approx. 3.5-4.0) (50/30°C) I/h 2.5; Residual head for the system 2) mbar 250; Nominal flow rate in heating (ΔT=20K) l/h 1033; Flow regulation temperature 3) °C 30-75; Expansion vessel capacity I 8; Maximum water content in the system 4) I 180; Expansion vessel pre-charge pressure bar 0.75; Expansion vessel pre-charge pressure bar 0.75; Domestic hot water regulation temperature °C 35-60; Minimum water flow rate l/min 1.7; Domestic hot water production (ΔT = 30K) l/min 13.5; Domestic hot water comfort star rating (prEN 13203) - HH; Maximum domestic hot water overpressure bar 10; Minimum water pressure bar 0.15; Power supply V/Hz 230/50.