An iron has a heel on which the iron can rest during inactive ironing phases, an internal reservoir, a fill opening fluidly connected to the internal reservoir, a fill opening cover movable between a closed position and an open position, a seal configured to seal the fill opening when the fill opening cover is in the closed position, and a vent which is fluidly connected to the internal reservoir when the fill opening cover is in the closed position. The seal includes a barrier part extending into the internal reservoir, and a ventilation orifice which is fluidly connected to the vent, and which opens into the internal reservoir, the barrier part and the ventilation orifice being configured so as to prevent liquid from flowing from the internal reservoir and through the vent when the fill opening cover is in the closed position and the iron rests on the heel.