This normally not my area but in searching for the perfect AC generator head I came across this seller:
www.doctordiesel.com/indexHe offers Tankless On Demand Biodiesel fueled hot water heaters, modern nonelectric(pretty) Biodiesel heating stoves, Bio making equipment, newsletter, ect.
No generator heads at this time. And I burn wood. So no commercial consideration or affiliation.
He did sound like a reasonable fellow on the phone.
SteveU.