... energy-saving coal furnace can save coal by about 20%.6. Production cost reduced greatlyDue to the above characters of this ... needs about RMB 6,400 yuan; calculating as per RMB 0.5 yuan per degree and needing 5520 degree of electricity per unit ... yuan; calculating as per RMB 0.5 yuan per degree and needing 6,000 degree of electricity per unit, it needs about RMB3 ...