... movement part, investment, low maintenance of provinces, YunHangFei low cost.3. forced ventilation, boost output quickly, full.4. Structure is ... , gas boiler, electrical heating boiler2.Automatic water softener equipment.3.HW series high intelligence unit heat exchanger, SFP efficient floating ... (%)707272727281818181 Boiler pictures :Chain grate ,bars ,links ,drive bars : 2t Coal-fired steam boilers