XBDW22 is double wall heat exchanger designed for application where the flow mediums are not allowed to mix. The double wall heat exchanger prevents primary media to be mixed with the secondary media if there is and internal leak in the unit. Two stainless steel plates separate primary and secondary side with an air gap in between. In the event of a leak, the leaking media flows into the air gap to the outside, enabling visual detection of the leak applications.