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.