Heat retriever

Claim 1

A heat retriever, comprising, in combination: (a) a shell provided with an inlet and an outlet for permitting a fluid to be heated to be passed through the shell; (b) a vent pipe attachable to a flue pipe of a furnace and arranged extending through the shell; and (c) a plurality of retriever pipes each connected to and arranged in parallel with the vent pipe and disposed entirely within the shell for forming a bypass around a portion of the vent pipe for combustion gases received from the associated furnace flue pipe and exposing the fluid to be heated to a larger heat transfer surface, and the vent pipe including restrictor means for diverting the combustion gases from the vent pipe to the retriever pipes, the restrictor means including opposed deflector fins terminating the retriever pipes at an entrance of the retriever pipes and being extensions thereof into the vent pipe and disposed upstream of a flow of combustion gases through the vent pipe, the fins being downstream of the entrance to the retrieve pipes and extending into the vent pipe for diverting combustion gases into the retriever pipes, the retrictor means further including a hollow, frustum of a cone disposed within the vent pipe downstream from the entrance to the retriever pipes for providing a resistance to the flow of combustion gases and causing the combustion gases to flow into the retriever pipes as a path of less resistance.