Maxchanger all-welded plate heat exchanger occupies 30 to 50 percent of the space required for a shell-and-tube exchanger in the same application. Single and multiple designs are available to suit any application. Channels formed between the specially dimpled, welded plates direct the two heat transfer media counter-currently through alternate paths to maximize efficiency. It has a close temperature approach capability of less than 2oF. Circle 210, Tranter PHE Inc., (940) 723-7125,