Neither of the burners I've used have any markings on them. I agree with DeRoux's, the higher pressure the regulator the more likely the burner is high output. Most of the high BTU burners run at 20psi. The lower ones are 10psi.
I'd bet that most any turkey fryer makes enough heat to boil 10 gallons. They're supposed to take oil to 350 degrees, after all. Higher output just gets you there faster. My 185k/20 psi burner will take room temp water for my extract brews to 160 degrees in about 10-12 minutes, depending on the ambient temp. Wide open, it sounds like a jet taking off.
Fire... Fire! He hehe heh he. (in best Beavis text impersonation)