A steam oven having a housing, a cooking chamber located within the housing, a water tank receptacle connected to the housing, the water tank receptacle comprising: a reservoir, an inlet fitting positioned above the reservoir, a false bottom positioned above the reservoir, and a reservoir outlet extending through a bottom of the reservoir. A water tank is selectively positionable on the water tank receptacle above the false bottom, the water tank having an outlet fitting configured to fluidily connect to the inlet fitting upon positioning the water tank on the water tank receptacle.