Coil Type Steam Boilers

Is a vertical water tube type boiler in which the flame passes through the inner side of the coil and the flue gases return back to travel on the outer side of the coil, and then pass through a economizer before leaving through the chimney. Instant Steaming and pressure buildup best suited for process steam heating needs. Large heating surface areas. Large furnace and grate areas. Optimum exhaust gas temperatures. Optimum fuel to air ratio.