Double drum boiler is able to use natural gas, city gas, light oil, heavy oil, coal, biomass,rice husk, wood, corncob, etc. Double drum industrial steam boiler for sale is widespread in Machinery, metallurgy, chemical, textile, paper-making, food industries, industrial and civil heating ,etc. ZG manufacture SZS double drum boiler and SZL double drum steam boiler with capacity 2-35 ton. Double drum steam boiler http://www.zgboiler.ph/Double-drum-steam-boiler.html