HEAT EXCHANGER AND HEAT PUMP TYPE HOT WATER GENERATING DEVICE USING SAME

摘要

The purpose of the invention is to provide a heat exchanger and a heat pump type hot water generating device using the heat exchanger that can effectively suppress deposition of scaling without decreasing the flow rate of water flowing inside and that allow maintenance work to be simplified. To achieve this purpose, provided is a heat exchanger comprising a first pipe that has a heating medium flowing therein and a second pipe that has water to perform heat exchange with the heating medium flowing therein, wherein the heating medium flowing in the first pipe and the water flowing in the second pipe form a counter flow, and the first pipe comprises an internal heat exchanger by which the heating medium flowing on the upstream side of the first pipe exchanges heat with the heating medium flowing into the first pipe.