Wood chip and pellet boiler The KWB Multifire wood chip and pellet boiler is a multi-talented system. The boiler is particularly robust and economical in its fuel consumption. In the output range between 20 – 120 kW, the KWB Multifire is the ideal central heating system for multi-family houses as well as agricultural and commercial businesses. KWB crawler burner: Full fuel flexibility The KWB Multifire wood chip or pellet heating system wins due to its particularly robust design. At its core is the KWB crawler burner. Made of high-alloy and self-cleaning cast grate elements, it is manufactured according to industry standards and functions like a type of “conveyor belt” for fuel. The flexible and robust grate has no trouble working with various fuel qualities. This makes you even more flexible when heating with wood chips or pellets. Economical and efficient fuel consumption The KWB Multifire operates particularly efficiently. The fuel is burned in a highly efficient and economical manner because the grate of the KWB crawler burner, due to its continuous operation, is very flexible and able to adjust to the fuel quality or characteristics. The ash does not contain any unburned residues, no fuel is wasted. The boiler additionally detects how much fuel is needed and when. If there is no demand, it will not continue heating. Because the KWB Multifire cleans itself during ongoing operations, your home is continuously warm. Even the heat exchanger cleans itself and removes its own ash. It also has special shaped turbulators to ensure that maximized heating energy is transferred from the exhaust to the heating system without compromising efficiency. Easy ash removal The optional two-part ash box, which can be easily unlocked and pulled out with its carrying handles, ensures even more convenience thanks to its integrated fill level monitoring. This makes it even easier to empty the individual ash containers because they are lighter. Thanks to the clean combustion and low fuel consumption, the ash box does not need to be emptied more than once a month. cleanEfficiency technology The KWB Multifire comes with the cleanEfficiency label. This label stands for the lowest emission values, highest efficiency and economy, and the perfect interplay between construction and control elements.