Found this at Green Building Elements. Could be a nice addition to a low energy consuming environment.., like an Earthship. You can buy these in the States for a meager 30 bucks.., that’s just 20 Euros.., without postage. Or you can try and make one yourself.., it is doable. Luckily, Heat Stick explains how they made them…

This is just to easy, even I could make it. you could save a bundle on money if you would need one of these. Watch the video at VideoJug.