Heat exchanger and hot water apparatus

A heat exchanger for exchanging heat between a heating gas which flows outside and water and/or hot water which flows inside, the heat exchanger comprising:

• a case including an inlet through which the heating gas flows in, an outlet that faces the inlet and through which the heating gas flows out, and a peripheral wall portion which connects the inlet and the outlet to each other;
• a heat exchange portion including a plurality of heat transfer plates surrounded by the peripheral wall portion of the case and layered on one another, each of the plurality of heat transfer plates extending in a direction from the inlet toward the outlet;
• and
• a straightening vane surrounded by the peripheral wall portion of the case and rectifying the heating gas, wherein
• the straightening vane includes a top plate portion which covers the plurality of heat transfer plates so as to close a space between the plurality of heat transfer plates in end portions of the plurality of heat transfer plates in a direction intersecting with a direction of layering of the plurality of heat transfer plates when the heat exchange portion is viewed from the inlet toward the outlet,
• an outermost heat transfer plate of the plurality of heat transfer plates includes at least any of an inflow portion through which the water and/or hot water flows in and an outflow portion through which the water and/or hot water flows out,
• the top plate portion extends from the end portions of the plurality of heat transfer plates to an inner side relative to at least any of the inflow portion and the outflow portion in the direction intersecting with the direction of layering of the plurality of heat transfer plates when the heat exchange portion is viewed from the inlet toward the outlet,
• the top plate portion includes a first top plate portion and a second top plate portion separate from the first top plate portion,
• the first top plate portion extends from the end portions of the plurality of heat transfer plates to the inner side relative to the inflow portion in the direction intersecting with the direction of layering of the plurality of heat transfer plates when the heat exchange portion is viewed from the inlet toward the outlet, and
• the second top plate portion extends from the end portions of the plurality of heat transfer plates to the inner side relative to the outflow portion in the direction intersecting with the direction of layering of the plurality of heat transfer plates when the heat exchange portion is viewed from the inlet toward the outlet.