AERCO has been an industry leader in water heating design for 65 years ever since it developed the first on-demand temperature-controlled water heater that didn’t need storage. In addition to the original B+II WaterWizard, AERCO offers a broad portfolio of indirect-fired, water-to-water and steam-to-water water heaters that provides you with a high efficiency system and instantaneous hot water across a wide variety of commercial applications from small multi-family housing to large hospitals, universities and five-star hotels.