... one third of the original fuel cost (coal and oil).6.Environment protection: no harmful gases, waste water and ... more than 100,000 yuan, more than oil, gas direct fired boiler oil, burning gas savings cost 50-70%, ... . C. Burning sawdust, wood powder, wood pellet, oil seed shell and other biomass materials D. Cost is ... a half of fuel oil and fuel gas. E. No harmful gas, waste ...