Size: 20 in. X 20 in. With 1" Inlet and 1 " Outlet. Includes Hawken Dura Max Heat Exchanger ONLY This is a top of the line heat exchanger and has more fins per square inch than most competitor's, which means that when the temperatures drop below zero the cheaper ones have a hard time keeping up. Don't get stuck with something that cant keep up with the demand. The Dura Max is a quality product. THIS IS ONLY THE WATER TO AIR EXCHANGER. IF YOU WANT THE KIT WHICH INCLDES THE FITTINGS AND THERMOSTAT CLICK THE FURNACE KIT'S TAB.
