How about just an off-the-shelf interior heater (probably could find it cheaper): Kat's 37100 Automotive Interior Heater with 900 watts power 120 Volts!
Or if you're feeling lucky, make one out of a ceramic heater element where the old heater core was (see Jerry's excellent EV site EV Weblog: Bring on the Heat).
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Any sufficiently advanced technology is indistinguishable from magic. - Clarke's Third Law
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