Energy efficiency class A. Energy efficiency index 99. Nominal heat output . space heating output kW 8.30. water heating output kW . Maximum operating pressure bar . Testing pressure bar . Water content l . Thermal discharger . Efficiency % 75.11. CO at 13% O2 % 0.0921. PM emissions at 13% O2 mg/Nm3 36.50. NOx at 13% O2 mg/Nm3 99.74. OGC at 13% O2 ...