It looks pretty awesome, is it expensive? Maybe not an every day rider but would really be awesome to putt around your local antique engine show. Looks like a propane fired monotube boiler? I think that's probably the best option for a small bike, light, quick heating and pretty resistant. Plus its clean burning and a lot easier to keep going that coal fired ;) Not sure what you need all that fuel for, unless you intend to run for hours at a time.