Tetsubo said:
How much heat does the Flame weapon enhancement produce? Could you, for example, use that heat alone as a survival tool? I can see several advantages to it over an actual fire: no smoke and it consumes no fuel. Does it consume oxygen?
I can just see some fighter heating his dinner over his +1 Flaming Axe...
Well, a flaming weapon requires either flame blade, flame strike, or fireball.
Flame blade:
"A flame blade can ignite combustible materials such as parchment, straw, dry sticks, and cloth."
Flame Strike:
No such statement on combustibility.
Fireball:
"The fireball sets fire to combustibles and damages objects in the area. It can melt metals with low melting points, such as lead, gold, copper, silver, and bronze. If the damage caused to an interposing barrier shatters or breaks through it, the fireball may continue beyond the barrier if the area permits; otherwise it stops at the barrier just as any other spell effect does."
So, unless your flaming weapon was made by a Cleric, it produces enough heat to either combust "parchment, straw, dry sticks, and cloth" or "melt metals with low melting points, such as lead, gold, copper, silver, and bronze." The first doesn't seem like enough to cook meat, but the second might be (Google tells me the melting point of gold is 1900F or 1000C--ouch!). I guess you want a Wizard to make your flaming sword, not a Cleric or Druid.
EDIT: Well, I guess paper burns at 421F (216C) which is enough to cook meat, or to bake, or most cooking needs.