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When you change into a fire elemental, you gain the burn ability. The DC has a calculation below. Does a normal PC have only 10+CON MOD since they don't have racial HD or do you add half your character level?
Burn (Ex)
A creature with the burn special attack deals fire damage in addition to damage dealt on a successful hit in melee. Those affected by the burn ability must also succeed on a Reflex save or catch fire, taking the listed damage for an additional 1d4 rounds at the start of its turn (DC 10 + 1/2 burning creature's racial HD + burning creature's Con modifier). A burning creature can attempt a new save as a full-round action. Dropping and rolling on the ground grants a +4 bonus on this save. Creatures that hit a burning creature with natural weapons or unarmed attacks take fire damage as though hit by the burning creature and must make a Reflex save to avoid catching on fire.
If you look at the polymorph subschool description it states you calculate the DC as if it were the spell that grants it (14+stat mod for Elemental body I).