KWB Multifire 100 kW

KWB – premium Austrian biomass heating

Founded in 1994, KWB, the premium Austrian manufacturer specializes in wood-based heating systems. Its Multifire boilers can utilize both wood chips and pellets.

Multifire 100 – heating with wood chips or pellets

100 kW output class biomass boiler for the heat supply of larger buildings, sites, and agricultural facilities. The dual fuel type allows for flexible procurement.

Key advantages

• Bottom-feed combustion: The feed screw delivers fuel to the burner from below, maintaining a uniform fuel bed.
• Afterburning ring and high-temperature combustion zone: The intensive mixing of air and combustible gases promotes more complete burnout.
• Lambda and draft control: The regulation jointly monitors the oxygen available for combustion and the pressure conditions in the combustion chamber.
• Automatic heat exchanger cleaning: Special turbulators in the vertical heat exchanger keep heat transfer surfaces clean by removing deposits.
• Two ash removal screws: Ash automatically travels from the combustion chamber into the connected ash bin, reducing manual ash removal work.
• Ash compression and fill level monitoring: The system compresses the ash entering the collector, and level monitoring prevents the ash bin from overflowing.
• Multi-stage burn-back protection: A fuel quantity sensor, safety extinguisher, and gastight closing fire protection damper protect the feeding path.
• KWB Comfort control: The operation of the boiler, heating circuits, buffer storage tank, and domestic hot water can be linked into a shared control system.
• Wear-resistant feed screw: The stainless steel, carbide-coated screw surface is designed to withstand the demands of continuous fuel feeding.

Important factory data

• Wood chip nominal heat output: 99 kW for the W33 variant listed in the catalog.
• Factory partial load point: 27.6 kW; nominal efficiency: 91.1%.
• Boiler water capacity: 167 liters.
• Maximum operating pressure: 3.5 bar; boiler temperature: 65–90 °C.
• Minimum return temperature: 55 °C.

Price of a new boiler – for comparison

Fröling T4e 100 ESP, 14711ESPL: 32,036.50 EUR gross (19% German VAT; calculated net: 26,921.43 EUR). Source of new equipment price – open ↗, price date: October 5, 2026. A new boiler with a left-hand stoker, electrostatic particulate filter, and integrated return temperature lift. Complete storage extraction and installation are separate system costs; delivery to Hungary must be agreed upon separately.

Factory documentation – open ↗.

Fuel and application: a system scalable for heating horticultural facilities, workshops, and agricultural buildings. In the case of sawdust, shavings, untreated carpentry waste, or cherry pits, please consult us regarding the specific boiler, feeder, and factory fuel specifications; their usability must be checked on a model-by-model basis.

Brands available in the ProfiKazán product range

AGRO Forst & Energietechnik, Alfa Laval, Austria Email, Binder, Biral, Buderus, Clima, Delphis-therm, EDER, Elco, Fröling, GEA, Gilles, Grundfos, Grünbeck, Guntamatic, HAPPEL / Ziehl-Abegg, Hargassner, HDG, Heizbösch, Herz, Hoval, Kampmann, Kränzle, KSB, KWB, LOOS, Lopper, Lowara, Mawera, Nolting, ORION / AL-KO, Picopello, Pneumatex, Pollhuber, Prüller, Reflex, Remeha, Ruwac, Schwank, Sieger, Siemens, Spanex, Varem, Viessmann, Wilo, Windhager, Wolf, YORK.

Heating systems and related equipment in one place

Categories in our catalog: Spare parts, Chip feeders, Wood chip boilers, Wood gasification boilers, Gas boilers, Steam boilers, Heat exchangers, Heat pumps, Infrared heaters, Industrial vacuum cleaners, Industrial cleaning machines, Warm air heaters, Hot water storage tanks, Measuring instruments, Oil boilers, Pellet boilers, Pumps, Expansion vessels, Unit heaters, Multi-fuel boilers, Controls, Water treatment.

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