Energy efficiency class A. Energy efficiency index 105. Nominal heat output . space heating output kW 6.55. water heating output kW 7.55. Maximum operating pressure bar 2. Testing pressure bar 4.0. Water content l 19.00. Thermal discharger . Efficiency % 79.53. CO at 13% O2 % 0.0738. PM emissions at 13% O2 mg/Nm3 36.40. NOx at 13% O2 mg/Nm3 120.66....