This YB Series Water Source Heat Pump is Single Stage, with a Vertical Cabinet Configuration. The water Coil material is Copper. The Control Option is an Aurora™ Base Control (ABC). The Air Coil Option is all Aluminum, No Coating, Standard Range. The Cabinet Option is Unpainted, 1 in MERV 4, with a Filter Rail. Drain Pan is Composite, with No Secondary Connection. The Sound Kit Option is Included.