Step 6: Update: First Use
Although only ~8" tall, with 3 tea lights, this little heater worked just as expected in my GF's SUV. Camped out by the beach in Orange County, CA, we warmed up enough to have to open the windows. The tea lights run for over 3.5hrs and cost as little as 0.99 cents for a 20 count pack. Overall, it beats occasionally having to start the car to run the heater.
This was definitely a worthwhile project, and will be very useful in our tent during winter camping!
I'll get actual temp readouts soon:)