Innovation, AERCO’s newest line of premium water heaters, features a tankless design, advanced condensing/modulating technology and a scale-resistant heat exchanger. The water heaters feature up to 20:1 turndown, +/-4° F temperature control, up to 99% efficiency and are available in 600, 800 and 1,060 MBH sizes. The helical firetube heat exchanger is time-tested to be impervious to thermal stress for extended life. Enhanced waterside flow distribution maintains constant minimum velocities across the heat exchanger, keeping solids in suspension and reducing scale dropout to maintain high-efficiency performance and long life.