A feed gas conditioner includes a passageway with a plurality of heating elements positioned within the passageway. A plurality of baffle assemblies can cause a fluid flowing through the feed gas conditioner to flow in a serpentine flow pattern so that the fluid flows transverse to at least a portion of the heating elements. The baffle assemblies can each include two or more baffle elements, the baffle elements being positioned at an angle relative to each other. The heating elements can pass through passages within one or more of the baffle elements.