Q 132 What spells and metamagic feats can a cleric take in order to use the Fiery Burst reserve feat?
A 132 Produce Flame (Fire Domain 2), Darkfire (3), Flame Strike (5), Fire Storm (8/Fire Domain 7), Wall of Fire (Fire Domain 4), Fire Seeds (Fire Domain 6), Elemental Swarm (Fire Domain 9) - covers every spell level from 2 to 9.
Alternatively, just take the Energy Substitution (Fire) feat, and modify a damaging spell for each level so that it deals fire damage. For when you don't want the Fire domain.
Second alternative, take the Arcane Disciple variant, and pick an arcane spell with the fire descriptor for any level you can't find a cleric spell with it. It might be hard to get a 9th level spell pre-epic this way, unless there's a cleric spell of that level I don't know of with a set fire descriptor...
Third alternative, Heighten Spell feat, and simply apply it to a cleric spell with the fire descriptor, raising it to the highest spell level you can cast.