I'd go with some asbestos pants. Sometimes you just don't want your fiery junk hanging out there!
Alternately, maybe he's seeking an heir. In his younger days he had dalliances with a sultry air elemental, and they had a child, Sirocco. Unfortunately he's been a bit of a deadbeat dad, and they lost touch. In his advanced age, he's come to regret this, and wants the primers to locate his kid and help them reconnect before he burns out. For an added twist, maybe its all a con, and he really just wants to sacrifice the kid, thinking the infusion of air will "fan the old flames" so to speak and maybe he's back up to the 4th hottest, 3 on a good day and in the right light.