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KWB MultifireRobust & economical heating
  • Flexible choice of fuels thanks to the unique crawler burner
  • Particularly efficient operation
  • More convenience thanks to a divided ash box
  • Particularly clean combustion

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.
 

Advantages in detail

Wood chips: Safe operation thanks to the one-chamber cellular wheel sluice

Fuel is transported and added by the one-chamber cellular wheel sluice with hardened, replaceable cutting edges, a deep filling chamber and large sealing surfaces. It consists of a rotor with one chamber. As a result, the connection to the fuel conveyor is always tightly sealed even when the fuel is transferred to the burner and functions as a burnback protection thereby maximizing the operational safety of the system.

Efficient exhaust gas recirculation

The optional exhaust gas recirculation is installed at the boiler’s exhaust gas connection. It takes a portion of the cooled down exhaust that is produced during combustion and recirculates it to the combustion chamber. This protects against wear even during continuous operation under peak load and cools the firebed at the grate thereby minimizing the fine dust production.

Quiet and minimized energy consumption with the hopper

The KWB Multifire can be optionally equipped with a 175 l-measuring hopper. It is automatically filled with wood chips from the storage room. This means that the conveyor system starts up less frequently, and wood chips are only conveyed once the hopper is empty. This reduces noise and minimizes the power consumption. Thanks to the hopper, the boiler can be supplied with fuel if needed (e.g. during nighttime hours).

KWB Dust Filter E Plus

The KWB dust filter functions on the principle of electrostatic particle separation and removes the fine dust contained in the exhaust gas. The removed filter dust is collected in a generously-dimensioned ash tray which is conveniently and cleanly operated from the front. With the KWB dust filter EPlus, fine dust is no longer an issue, even with changing fuel qualities.

  • Wood chips: Safe operation thanks to the one-chamber cellular wheel sluice

    Fuel is transported and added by the one-chamber cellular wheel sluice with hardened, replaceable cutting edges, a deep filling chamber and large sealing surfaces. It consists of a rotor with one chamber. As a result, the connection to the fuel conveyor is always tightly sealed even when the fuel is transferred to the burner and functions as a burnback protection thereby maximizing the operational safety of the system.

  • Efficient exhaust gas recirculation

    The optional exhaust gas recirculation is installed at the boiler’s exhaust gas connection. It takes a portion of the cooled down exhaust that is produced during combustion and recirculates it to the combustion chamber. This protects against wear even during continuous operation under peak load and cools the firebed at the grate thereby minimizing the fine dust production.

  • Quiet and minimized energy consumption with the hopper

    The KWB Multifire can be optionally equipped with a 175 l-measuring hopper. It is automatically filled with wood chips from the storage room. This means that the conveyor system starts up less frequently, and wood chips are only conveyed once the hopper is empty. This reduces noise and minimizes the power consumption. Thanks to the hopper, the boiler can be supplied with fuel if needed (e.g. during nighttime hours).

  • KWB Dust Filter E Plus

    The KWB dust filter functions on the principle of electrostatic particle separation and removes the fine dust contained in the exhaust gas. The removed filter dust is collected in a generously-dimensioned ash tray which is conveniently and cleanly operated from the front. With the KWB dust filter EPlus, fine dust is no longer an issue, even with changing fuel qualities.

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