NOVELTY - A biomass or dendro gasifier comprises a hopper which contains: a perforated cone at the lower inside of Hopper that allows condensed moisture and tar to seep to the outside surface of cone, drip down, and be conducted along slanted plate fixed to the outside lower part of cone, and a gully or drain at the bottom end of hopper that collects condensed moisture and tar conducted and feeds it to the container at the side of Hopper bottom; and a firebox which is made of custom made castable fire concrete material, inside which combustion takes place.    USE - For producing low tar producer gas or wood gas that does not require scrubbing with water for the filtering of tar (claimed).    ADVANTAGE - The composition leads to low tar producer gas or wood gas that does not require scrubbing with water for the filtering of tar. The hopper allow moisture and heated liquefied tar created through the drying and pyrolysis of the wood, to be drained out of the hopper and be collected at the container at the side of the hopper bottom. This prevents excess moisture and liquefied tar seeping into the firebox where it can interfere with the efficiency of the reduction process thereby leading to high tar content producer gas. This cast-able fire concrete is high temperature resistant (up to 1500 degrees C) and has a 10 year life-time. The cast-able fire concrete gives very good thermal insulation and thereby raises the temperature of the combustion area. The higher temperature makes a good part of the remaining tars to crack, to form combustible gases. The design of the firebox with custom castable material raises the combustion area temperature and accelerates the cracking of the remaining tar, further improves the quality of the wood gas or producer gas.    DETAILED DESCRIPTION - A biomass or dendro gasifier comprises a hopper which contains: a perforated cone at the lower inside of the Hopper that allows condensed moisture and tar to seep to the outside surface of the cone, drip down, and be conducted along the slanted plate fixed to the outside lower part of the cone, and a gully or drain at the bottom end of the hopper that collects the condensed moisture and tar conducted and feeds it to the container at the side of the Hopper bottom; and a firebox which is made of custom made castable fire concrete material, inside which combustion takes place.