409 stainless steel construction, 20-year warranty, made in International Falls, Minnesota.
EPA-certified gasifier. Up to 99% combustion efficiency, up to 60% less wood.
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Traditional triple-pass heat exchanger design. About 40% wood savings.
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Automated multi-fuel option for flexible heating.
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Automated commercial systems, 300,000–950,000 BTU.
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Every model shares 409 stainless construction and a 20-year warranty. Here is how fuel, technology, and output compare across the lineup.
Spec
Pristine Series
Multi Pass Series
Flex Series
Biomass / Multifuel
Fuel
Wood (gasification)
Wood or coal
Wood pellets (auto-fed)
Biomass / multifuel
Core Technology
EPA-certified gasification
Triple-pass heat exchanger + Turbo Draft secondary burn
Automated pellet-fed combustion (EPA certified)
Automated triple-pass heat exchanger
Efficiency Claim
Up to 99% combustion efficiency, up to 60% less wood
About 40% wood savings vs. a competitors traditional furnace
Up to 96% efficiency
Triple-pass heat recovery
BTU Range
125,000 – 325,000 BTU
165,000 – 750,000 BTU
Up to 220,000 BTU
300,000 – 950,000 BTU
Day-to-Day Operation
Regular loading of wood, gasifier burn chamber
Regular loading of wood or coal, ash pan and grates
Automated hopper feed, runs for days unattended
Automated commercial feed system
Best For
Homeowners wanting the cleanest burn and lowest wood use
Larger properties wanting wood/coal flexibility
Hands-off heating without daily reloading
Commercial buildings and facilities, 20,000–32,000 sq ft