I built this to run an alternator to charge a battery bank. I don't have a boiler built yet, but runs great on air. Hope to belt it to a alternator soon.
http://i1121.photobucket.com/albums/...n/E41A1751.jpg
Here is the final video to the 8 part build on you tube.
https://www.youtube.com/watch?v=oSZ06rlNcBQ