The water cooling option, added to the air cooled system, incorporates a copper-nickel tube-in-tube condenser. A remote pump, elected by a switch on the cabinet, operates with the compressor and fan. Water cooling should be used in engine room or other confined installations. This type of condenser utilizes the scrubbing effect of water and is far more efficient than static water cooling.

BD systems use thin (half-inch), stainless steel cold plates, available in many sizes. These direct evaporator plates provide excellent thermal conductivity for cooling efficiency. They're mounted on stand-offs to allow air to flow on both sides. Refrigerators require a single plate which should be mounted as high as possible in your insulated box. Approximately 20% of the wall area should be covered.