KWB Multifire 20-80 kW

KWB – premium Austrian biomass heating

Founded in 1994, the premium Austrian manufacturer KWB 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 capacity class biomass boiler for the heat supply of larger buildings, sites, and agricultural facilities. The two types of fuel allow for flexible sourcing.

Key benefits

• 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 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 the 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 saturation monitoring: The system compacts the ash entering the collector, and level monitoring prevents the ash bin from overflowing.
• Multi-stage anti-burnback protection: A fuel volume sensor, emergency extinguisher, and gas-tight closing fire protection damper protect the feed route.
• KWB Comfort control: The operation of the boiler, heating circuits, buffer storage tank, and domestic hot water can be integrated into a common 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 specifications

• Nominal heat output with wood chips: 80 kW; factory partial load point: 22.4 kW.
• Nominal efficiency with wood chips: 91.3%.
• 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 80 ESP, 14709ESPL: 29,197.00 EUR gross (19% German VAT; calculated net: 24,535.29 EUR). Source of new equipment price – open ↗, data date: October 5, 2026. A new boiler with a left-hand stoker, electrostatic particle separator, and integrated return temperature elevation. Complete storage extraction and installation are separate system costs; delivery to Hungary must be coordinated separately.

Factory documentation – open ↗.

Fuel and application: a system that can also be sized for heating horticultural facilities, workshops, and agricultural buildings. In the case of sawdust, shavings, untreated carpentry waste, or cherry stones, 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 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 of 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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