Blowing off steam is all in a day's work for Vapor Power International. The company makes boilers powered by water tube steam generators with multiple coils that can easily be switched from a gas source to an oil fuel source. The company's products, which also include steam generators and thermal fluid heaters, are typically used in industrial, commercial, marine, and military settings. The firm has served customers such as Bethlehem Corporation, Heidtman Steel Products, and Penn State University. Pittsburgh-based investment firm TAG Equity acquired Vapor Power International in 2009.