KWB Multifire MF2 D/ZI 20 biomass boiler, KWB Multifire MF2 D/ZI 30 biomass boiler, KWB Multifire MF2 D/ZI 40 biomass boiler, KWB Multifire MF2 D/ZI 45 biomass boiler, KWB Multifire MF2 D/ZI 50 biomass boiler, KWB Multifire MF2 D/ZI 60 biomass boiler, KWB Multifire MF2 D/ZI 65 biomass boiler, KWB Multifire MF2 D/ZI 70 biomass boiler, KWB Multifire MF2 D/ZI 80 biomass boiler, KWB Multifire MF2 D/ZI 99 biomass boiler, KWB Multifire MF2 D/ZI 100 biomass boiler, KWB Multifire MF2 D/ZI 101 biomass boiler, KWB Multifire MF2 D/ZI 108 biomass boiler, and KWB Multifire MF2 D/ZI 120