[Vinnie]

Still being sold. Check it out.
http://www.powerflame.com/index.php

[thackney]

Thanks for that link, I didn’t realize the capabilities existed for such turndown ratios.

http://data.powerflame.com/support/supportdocs/Catalog/pdf/type-ac/AC-InstallationAddendum.pdf

I was thinking much more simplier units like the burners on stove. Most of those even switching between propane and natural gas require changing the burner, or at least nozzle tips.

Cheers!