Combined type miniaturized heat exchanger for heating hot water

The invention belongs to the technical field of heat exchangers, and particularly relates to a combined type miniaturized heat exchanger for heating hot water. The two sides of the plate heat exchanger are fixedly connected with connecting plates respectively. The side walls, away from the plate heat exchanger, of the pair of connecting plates are provided with fixed sliding grooves and fixedly connected with limiting blocks correspondingly. The limiting block slides in the fixed sliding groove. A first magnet is fixedly connected to the inner side wall of the fixed sliding groove. A second magnet is fixedly connected into the limiting block. The first magnet and the second magnet attract each other through magnetic force. The size of an existing heat exchanger can be reduced through the plate heat exchangers capable of being combined with one another, the portability of the plate heat exchanger is improved through the reduced size, a worker can conveniently install the plate heat exchanger in a narrow enviro