MKK Series are central heating boilers with fans which work with manuel fueling principle, fully electronic equipped. They are produced in suitable capacities for individual use as well as for centralized system use. Wood, coal, mining coal and lignite coal can be used as fuel. The boiler also provides hot water for use with a boiler addition. The heat transfer surface is high. Heat losses are minimized by high thermal insulation. With the advanced electronic control function, the combustion air is adjusted according to the amount of fuel. Thus, more energy is thrown into the chimney and the burning up the fuel is prevented.