Biomass pellet burner has the best price, owing to it has a hopper together with body. The pellet is easy for delivery and store.
Biomass sawdust burner has an extra fuel bin, so the price is higher than pellet burner, but the sawdust has the lowest cost compared to pellet and wood powder. The efficiency is 90-95%.
Biomass wood powder burner also need an extra fuel bin, but it has the best performance 95-98%.