Currently I carry around a hair dryer and extension cord to test the heat detectors in my buildings. I'd like to build something portable that runs on a 9-12V battery. The hottest I need is roughly 200 degrees F, more often than not I'm testing "Rate of Rise" heat detectors so a fast rise in temp is important to me.
I've looked around at common heat guns, they all seem to work on 120VAC, but they're blowing out several hundred more degrees than I need. So, I'm thinking a battery powered heat gun could be feasible for my needs. I'm not sure where to start for the heat source though. Peltier maybe?