An oven includes a cooking chamber, a cabinet at least partially surrounding the cooking chamber, and a water reservoir having a reservoir inlet and a reservoir outlet. The oven further includes a water fill assembly including an opening, a water-receiving cavity and a fill outlet from the water-receiving cavity, the water fill assembly defining a fluid flow path in from the opening and out through the fill outlet, a check valve in fluid communication with the fill outlet downstream of the fluid flow path defined by the water fill assembly, the check valve configured in a closed state under a force of gravity on at least a portion thereof and opening by a flow force of fluid out of the fill outlet and through the check valve, and a conduit connecting the check valve with the water reservoir inlet downstream of the fill outlet.