Air-passing grille, housing and heat pump water heater

The embodiment of the utility model provides an air-passing grid, a housing and a heat pump water heater, the air-passing grid comprises a plurality of wing-shaped grid bars, the outer contour of the cross section of each wing-shaped grid bar comprises a first arc-shaped section located on the windward side and a second arc-shaped section located on the leeward side, and the curvature of the first arc-shaped sections is larger than that of the second arc-shaped sections. According to the air-passing grille, the air resistance can be reduced.