KWB Multifire 20-80 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 80 – heating with wood chips or pellets

80 kW output class biomass boiler for heat supply in larger buildings, sites, and agricultural facilities. The dual fuel capability allows for flexible procurement.

Key benefits

• Bottom-feed combustion: The feed screw delivers fuel from the bottom onto the burner, maintaining a uniform fuel bed.
• Post-combustion ring and high-temperature combustion zone: Intensive mixing of air and combustible gases promotes more complete burnout.
• Lambda and draft control: The control system 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.
• Dual ash removal screws: Ash is automatically transferred from the combustion chamber to the connected ash bin, reducing manual ash removal work.
• Ash compaction and fill level monitoring: The system compacts the ash entering the collector, and level monitoring prevents the ash bin from overflowing.
• Multi-stage backburning protection: Fuel quantity sensor, emergency extinguisher, and gas-tight closing fire protection damper protect the feeding route.
• KWB Comfort control: The operation of the boiler, heating circuits, buffer storage tank, and domestic hot water can be linked into a joint 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 rated heat output: 80 kW; factory partial load point: 22.4 kW.
• Wood chip rated efficiency: 91.3%.
• Boiler water capacity: 167 liters.
• Maximum operating pressure: 3.5 bar; boiler temperature: 65–90 °C.
• Minimum return temperature: 55 °C.

New boiler price – for comparison

Fröling T4e 80 ESP, 14709ESPL: 29,197.00 EUR gross (19% German VAT; calculated net: 24,535.29 EUR). Source for new equipment price – open ↗, price date: October 5, 2026. A new boiler with left-hand stoker, electrostatic particulate filter, and integrated return temperature lift. Full storage extraction and installation are separate system costs; delivery to Hungary is to be agreed separately.

Factory documentation – open ↗.

Brands available in the ProfiKazán selection

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 radiant heaters, Industrial vacuum cleaners, Industrial cleaning machines, Warm air heaters, Hot water storage tanks, Measuring instruments, Oil boilers, Pellet boilers, Pumps, Expansion vessels, Fan heaters, Multi-fuel boilers, Controls, Water treatment.

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