Energy efficiency class A. Energy efficiency index 102. Nominal heat output . space heating output kW 12.00. water heating output kW . Maximum operating pressure bar . Testing pressure bar . Water content l . Thermal discharger . Efficiency % 76.91. CO at 13% O2 % 0.0988. PM emissions at 13% O2 mg/Nm3 26.40. NOx at 13% O2 mg/Nm3 100.04. OGC at 13% ...