A versatile steam boiler, Series EX is a go-to boiler for facilities that require two fuel sources. The design minimizes carryover and produces dry 99 percent saturated steam in less than 5 minutes from a cold start. Faster startup means less fuel used, greater savings and more responsible use of natural resources. Available in 100 hp and in 50-hp increments up to 300-hp models, the high pressure steam boiler design consists of rows of vertical tubes sandwiched between two round headers. Both headers are encased in a castable refractory with only the tubes exposed to flame or combustion gases. The upper header is attached to the lower header only by the tubes. As the tubes expand and contract, the headers float up and down accordingly. The floating-header concept allows for even thermal expansion of the tubes, reducing stress points within the boiler. The leaky-tube problems associated with firetube and bent watertube designs do not occur.