They do have one but it has not been tested so not EPA approved.
They also make a 2 million BTU chip burner. Not sure if that will need EPA approval or not.
They say there is a loophole in the EPA law that exempts commercial boilers. All they need to do to qualify for this is be over 350K BTU (require 3rd party testing)
I am not sure if that is true or not but if so, they will only have to quit making one model.