Follow the link below and you'll see a rocket heater in action. The
whole concept of Rocket Heaters and what makes them the success they
are is very easy to grasp ... and then very "do-able" when it comes to
doing yourself. Check out this video from YouTube and I think you may
get hooked on the idea.
http://www.youtube.com/watch?v=9uh2VExcdbY&feature=related