Heat exchanger assembly and water heater comprising same

A heat exchanger assembly comprising a heat exchanger unit having an inlet through which a fluid is introduced and an outlet through which the fluid is discharged,

• wherein the heat exchanger unit includes:
• a first plate;
• a second plate disposed on one surface of the first plate and defining, together with the first plate, an internal space through which the fluid introduced through the inlet flows to the outlet;
• a heating member coupled to at least one of the first plate and the second plate and configured to provide heat to the internal space;
• and
• a guide part disposed in the internal space and configured to guide the fluid introduced through the inlet toward a plate, to which the heating member is coupled, among the first plate and the second plate,
• wherein the heating member is a planar heating element,
• wherein the guide part includes:
• a plate-shaped first guide portion including a plurality of first holes;
• and
• a plate-shaped second guide portion including a plurality of second holes,
• wherein each of the first holes is formed in one of a “V” shape open toward the outlet and a “V” shape open toward the inlet,
• wherein each of the second holes is formed in the other one of the “V” shape open toward the outlet and the “V” shape open toward the inlet, and
• wherein the second holes overlap and communicate with at least two of the first holes.