Technical data Technical data Model Boiler heat output range in kW, 50/30° C Boiler heat output range in kW, 80/60 °C Boiler heat input range in kW Boiler heat input range in kW (liquid gas) Gas appliance category, DE Product ID number Boiler Installation TANTUM 25 Combination appliance Rated output efficiency 80/60 °C in % Efficiency 0.3 x rated output, 30 °C in % NOx class Energy efficiency rating, space heating Energy efficiency rating, hot water, XL Supply air-flue gas connection (diameter) in mm Heating appliance Dimensions (height / width / depth) in mm 750*** / 400 / 325 750*** / 400 / 325 750*** / 400 / 325 Boiler weight in kg Heater flow/return connection (external thread) Hot and cold water connection (external thread) Tank flow/return (external thread) Gas connection (external thread) Condensate outlet diameter in mm * with cross-shaped mounting element max. drinking water pressure in bar max. all. water hardness in mol/m³ max. water rated output in kW Domestic hot water continuous output (∆t=35K in l/min) min. tapping rate l/min Domestic hot water - initial tapping rate in l; 45°C / 55°C / 12 l/min** Domestic hot water - initial tapping rate in l; 45°C / 60°C / 12 l/min** Flue gas mass flow (max.) in g/s Draught, flue gas side in Pa Flue gas temperature at rated output in °C Electrical connection max. electrical power consumption in W * corresponds to 15°dH or 27°fH or 19°e ** Hot water tapping temperature / storage tank charging temperature / tapping rate *** Total installation height appliance + s