Need for heat

Hi Everyone,
I'm doing a experiment were I need to get a ¼" x 8" x 12"
piece of aluminum to 150-200 degrees F. Outside temperature would be
around 70 degree F. Whatever I use needs to run off of 6-12vdc. In the
past I used a light bulb in a metal can (120vac), but it is too hard to
regulate the temperature that way for me.
I was thinking of using a Peltier type chip for a heat source. I find
a lot of info about its cooling affect (or lack of) but not much about
the heat effect. Could this be done effectively on battery power
(6-12vac)?
The other way I was thinking about is to use resistors. But I have no
clue on the size of the resistors or how many I would need to get to
the metal too that temperature. Anyone have a formula or past
experience about this?
Or is there something a lot easier that I'm not thinking of?
Thanks Jeff

.

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