A vaporizing device includes a reservoir defining a receiving space. A wick is engaged in the receiving space. A heat conducting member caps on the reservoir and includes a hole extending therethrough connecting and in communication with the receiving space and including a recess. The recess is delimited by an inner ridge, an outer ridge and a floor side of the heat conducting member. The outer ridge is radially spaced from the inner edge. The floor side extends radially between the inner and outer edges. The inner ridge delimits an opening corresponding to the hole. The wick has an end extending through the hole and the opening. Liquid to be vaporized by the vaporizing device is filled in the recess and fuel is filled in receiving space.
