The reserve feat Fiery Burst says:
As long as you have a fire spell of 2nd level or higher available to cast, you can spend a standard action to...
The Summon Monster I spell (and, by extension, all summon monster spells) say:
When you use a summoning spell to summon an air, chaotic, earth, evil, fire, good, lawful, or water creature, it is a spell of that type.
If I have Summon Monster V prepared, I technically could use it to summon 1d4+1 small fire elementals (off the Summon Monster III list). Does this mean I have a fifth-level fire spell "available to cast", and thus I can use the fiery burst feat with a spell level of 5?