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START | wall-hung condensing boilers 700 mm 400 mm 275 mm TECHNOLOGY FOR COMFORT AND ENERGY SAVING New combustion group with condensing heat exchanger in stainless steel High performance plate heat exchanger developped by Riello 8 litres side expansion vessel New hydraulic group with DIN type connections sequence Low NOx emissions CLASS 6 (EN 15502) New flue flange featuring fast and safe click-fit connections and integrated flues analysis inlet High modulation ratio 1:8 on the whole range Compatible with the solutions of the new Riello HI, COMFORT platform integrating smart thermostats, App and boilers of new generation 6