A volatile material dispenser includes a housing that defines a longitudinal axis and is configured to receive a refill containing a volatile material and a wick. The volatile material dispenser also includes a cylinder that includes an inner wall that defines an opening and an interior edge, a resistor embedded in the cylinder, and a heater chassis that includes an inner wall that defines a passage between an upper end and a lower end. The upper end of the heater chassis abuts the interior edge of the cylinder. In addition, the inner wall of the cylinder extends away from the longitudinal axis at a first angle and the inner wall of the heater chassis extends away from the longitudinal axis at a second angle.