... as well as branches, leaves, bark, roots, wood chips, bamboo powder, sawdust and other leftovers of forest ... hour than a ton of coal-fired boilers burning coal directly to cost savings of 30-40 ... more than oil, gas direct fired boiler oil, burning gas savings cost 50-70%, the annual cost ... need to convert the original boiler. C. Burning sawdust, wood powder, wood pellet, oil seed shell and other biomass ...