Abstract: A fireplace heat exchanger having input means that is directly connected to a blower assembly, air to be heated is drawn in by the blower assembly and forced directly through the input means into a heat reservoir that is suspended directly above or within the flame of the fireplace. The air is heated within the heat reservoir and then forced through an output means that includes a plurality of discharge ports through which the heated air is dispersed into a room. An aesthetically appealing manifold covers those portions of the input and output means that are outside the fireplace. That portion of the manifold that covers the output means includes a corresponding plurality of discharge ports through which the heated air is dispersed. The input and output means slidably fit within the input and output riser tubes so the heat exchanger can be adjusted for fireplaces of various depths. The heat exchanger can be used with fireplaces having a frame with closable doors, wire mesh curtains, or the like.