Stainless Steel Tubes and Copper Fins The ultra-clean A32 series is appropriate for applications that employ deionized water The Cenden A32 Series Heat Exchanger couples an efficiency approaching that of our all-copper B22 design in a high-reliability 9.5" x 9.0" heat transfer area. Thermal capability ranges up to 100 Watts / ÂșC, depending on configuration. Each A32 Unit utilizes:Cenden's ...