HOW TO - Almost free garage heat - just drink a lot of soda

http://blog.makezine.com/archive/2007/04/how_to_almost_free_garage.html?CMP=OTC-0D6B48984890
HOW TO - Almost free garage heat - just drink a lot of soda

Solarbox 1453 Resized1
Daniel made a fantastic soda-can water heater, he writes -

While I have electricity out to the garage now, heat has been an issue all winter long. Mattar graciously lent me his kerosene heater, which did an okay job of taking the bite off the chill. Insulating the garage would go a long way to help keep the bitter Vermont cold out, but that's a project for another day. I decided instead to take advantage of the south-facing side of the garage and build a solar furnace to collect some of that sunshine just bouncing straight off my garage. My dad built one years ago and said he recorded a 110-degree temperature differential between inlet and outlet. And I had enough scrap materials around the basement to do something similar to what my dad built.