The A.O. Smith Cyclone Xi is a commercial gas water heater that combines an advanced internal helical coil heat exchanger and up to 500,000 Btu input for high-efficiency energy transfer. The unit is glass-lined and has powered anodes for tank protection. Four units can be manifolded to provide total storage of 520 gal., and total input of 2 million Btu — ideal for mid-sized restaurants and 50- to 300-room hotels. The Cyclone is designed to fit in corners and flush against the wall for maximum installation flexibility.