Fan assembly and water heater

A fan assembly for sending gas, comprising:

• a fan including a fan case having a first internal space, an impeller accommodated in the first internal space, a drive source for driving the impeller, and a rotation shaft coupling the impeller and the drive source to each other;
• and
• an emission connection portion including a connection portion case having a second internal space and provided with an emission port for emitting gas sent from the fan to outside of the fan assembly through the second internal space,
• in a plan view from a direction of axis of the rotation shaft, a tongue portion being located at a boundary between the first internal space and the second internal space, and the tongue portion being provided to extend to a position at least reaching a virtual straight line connecting a center point of the emission port and a center of rotation of the rotation shaft to each other, from one end of the boundary toward the other end of the boundary, wherein
• in the plan view from the direction of axis of the rotation shaft, an opposing wall portion of the tongue portion opposed to an outer circumference of the impeller has a linear region extending linearly from a side of the other end of the boundary toward the one end of the boundary and a curved region located at a side of the one end of the boundary relative to the linear region and continuing to the linear region,
• in the linear region, a distance between the opposing wall portion of the tongue portion and the outer circumference of the impeller decreases from the side of the other end of the boundary toward the one end of the boundary, and
• the emission connection portion has a drainage water discharge portion communicating with the second internal space.