The method includes first defining at least one channel within a first housing of a heater assembly, the at least one channel extending from a first end to a second end of the first housing, second defining a cavity in the first end of the first housing, third defining a first reservoir in the second end of the first housing, the at least one channel being in fluid communication with the first reservoir, and fourth defining an opening within a first wall within the first housing, the opening causing the first reservoir and the cavity to be in communication with each other.