Heat exchanger and gas water heater

The invention belongs to the technical field of water heaters, and particularly relates to a heat exchanger and a gas water heater. The heat exchange shell aims at solving the problems that an existing heat exchange shell is poor in sealing performance, and smoke leaks. The end plate assembly of the heat exchanger comprises an end plate and an annular reinforcing frame, the end plate comprises a plate body and a turned-over edge, and the turned-over edge is formed by bending the side edge of the plate body away from a heat exchange space; the turnup is arranged on the outer side of the annular reinforcing frame in a sleeving mode, the annular reinforcing frame plays a role in improving the structural strength of the end plate assembly, and the structure is simple. The annular reinforcing frame is formed by annularly bending the reinforcing batten, the processing mode is simple, and the efficiency is high; the seam of the annular reinforcing frame is opposite to the flanging, so that the seam of the annular re