Airheater design software is a windows based user friendly design software. Using this package, Engineers can design a wide variety of air heaters for fired boilers and other applications where hot gas source is available. This software is provided with large database of waste heat gases and boiler exhaust gases. Using this software, all types of bare tube, fin tube and gill tube air heaters can be designed. Autodesign feature gives optimum design of air heaters. Users are alerted if any of the important design parameters exceed their limiting values.