Wood Chip Boilers

A wood chip boiler is an automated biomass boiler that burns wood chips instead of cordwood or pellets. It feeds fuel from a hopper into the burn chamber under automatic combustion control and transfers that heat into water for hydronic space heating.

A wood chip boiler feeds chips from a hopper into the burn chamber, where a controller like MBTEK's TIS TRONIC 660HD manages combustion and feed rate automatically. BIO DUO is built for automated, modulating combustion control rather than the two-stage gasification process used in MBTEK's cordwood boilers like UNI and TITAN Lambda.

Wood chips are a lower-cost, less processed fuel that is bulkier and less consistent than pellets, so wood chip boilers use larger hoppers and often pair with a dedicated storage and conveyor system. Pellet boilers use a more uniform, lower-moisture fuel that needs less storage volume for the same heating load.

Yes. BIO DUO 50 and BIO DUO 100 (170K and 340K BTU) are sized for large homes, estates, and light-commercial buildings. BIO DUO 150 and larger scale up to commercial, industrial, and large-building heating loads.

Choose Residential BIO DUO (50 or 100) for large homes and estates up to 10,000 sq ft, and Commercial BIO DUO (150 through 1000) for commercial, industrial, or large-building heating from 15,000 up to 95,000 sq ft. Add the Boiler Conveyor Storage System for automated fuel delivery on larger or continuous-run systems.

The Boiler Conveyor Storage System automatically delivers wood chips from storage into a BIO DUO hopper, reducing manual refilling and keeping combustion consistent. It is available in single-boiler and multiple-boiler configurations.

BIO DUO boilers are designed for graded, properly sized wood chip fuel with controlled moisture content. Wet or oversized chips reduce efficiency and increase ash and cleaning needs, so fuel quality and dry storage matter as much as boiler sizing.

Maintenance includes burning correctly sized, dry wood chips, removing ash, cleaning the burn chamber and heat exchanger, inspecting the chimney and seals, and servicing pumps, controls, valves, and the fuel feed or conveyor system annually.