UNI 40 wood boiler, 130K BTU

UNI is a wood gasification boiler built for homes, workshops, and estate heating. It burns firewood in two combustion stages and transfers the heat into a hydronic system for space heating and domestic hot water.

UNI 15 covers up to 2,500 ft², UNI 40 up to 4,000 ft², UNI 60 up to 5,000 ft², and UNI 95 up to 8,000 ft². For commercial or industrial-scale loads, see the UNI Industrial sizes (150–1000). Square-footage ranges are approximate — final sizing depends on heat loss, insulation, climate, and how the boiler will be used.

UNI and TITAN Lambda are both the stronger fit for wood gasification heating. TITAN Lambda adds automatic ignition and lambda-sensor combustion control for up to 95% efficiency; UNI's smart controller delivers 86%+ efficiency with a simpler design. PRO is the non-gasification, off-grid option that needs no electricity at all.

Yes — UNI pairs with a domestic hot water tank such as the APOLLO DHW80 to provide hot water alongside space heating from the same boiler.

Many wood gasification boiler systems benefit from a buffer tank, because a full burn can produce more heat than the building needs at that moment. Thermal storage can capture that heat, reduce cycling, and improve comfort when the system is designed correctly.

Maintenance includes burning dry wood, removing ash, cleaning heat exchanger surfaces, inspecting the chimney and flue, checking door gaskets, and servicing pumps, controls, valves, the expansion tank, and water quality.