To provide a generally-preferred and easily spreadable boiler device useful for protecting a natural environment, capable of recycling even a residue, simple in maneuvering operation, and providing safety and easy mind, in a high capacity boiler capable of reducing CO2 and capable of reducing fuel cost, while completely eliminating fossil fuel.

This biomass exclusive eco-boiler device receives auxiliary combustion by a burner by operation of an automatic control device by operating a furnace inside temperature sensor when the combustion effect reduces, and forcibly receives and sucks strong supply air by an exhaust chimney from a forced air supply port of the principle of a bamboo blowpipe, and causes complete combustion by generating heat convection by the whole combustion furnace, and stabilizes the furnace inside temperature by causing the maximum thermal effect by combustion, and continuously causes the complete combustion by eliminating generation of sludge. The residue generated according to this can be automatically discharged to an external part of the boiler.