Temp. distribution on the surface of the deflector in a retort small power boiler supplied with wood pellet was studied. Two V2O5 catalysts were deposited directly on the deflector surface or intermediately on SiO2 carrier and one Pt catalyst was deposited on an intermediate Al2O3 layer. The exhaust gases were studied for CO and NOx contents. Use of the catalysts resulted in redn. of NOx with CO or hydrocarbons present. The deflector-supported V2O5 catalyst was the most efficient.