While looking for similar information this morning, I came across a post on a different site (I think it was Chowhound, but it's lost now...) that said some US 'pro style' home cookers are manufactured for natural gas and later converted to LP, thereby loosing 2-3 thousand BTU per burner. I can't imagine companies would produce specs stating (advertising) a burner designed to work at 18,000 btu in natural gas as 16,000 for larger particulate LP. I would look at the burner info for the NG and go for the worst case scenario (-3000).

(I have no verification of that post, but it makes sense of my own experiences, those of my friends and some of the posts here on Garden Web, in which people with the same model range have such differing experiences)

Also, in the US, the quality of your LP is regulated locally or by the State and can vary. I live in the Caribbean and ours is self regulating (as in: people stop buying from companies that sell sooty, black burning LP). I can't imagine really dirty LP gas would be allowed anywhere in the US, but gas quality - even tank cleanliness - effects burner performance.

Of course, you can always call the company and ask. GE won't send certain range models to our island because of poor LP quality.

why don't you simply email or call up Wolf and ask them ?
they made it, and are certain to have the info, plus more

I did try that, but, it seems that it dos not say in black and white that when you ordre the model for LP, even costumer service could not confirm it, but from what they said, and they only read whats on there web site, that they can not confurm the diffrence if there is one between Natural and LP. DCS and Viking do have a diffente between N or LP and it logical because, there is more pressure on LP than on N gas, so there for they have to lower le pressure for LP - But what a wolf reprensentive told my vender, that there is no different between N or LP witch i dought

All manufactures use different orifice sizes for Nat Gas vs LP Gas. To add a complication they use different sizes for "High Altitude" as well

Yes rates = rate per burner

Weedmeister, I think you are incorrect about LP having less BTUs then NG. Check out this website Liquid Propane 101

If I have it backwards, I stand corrected. However the orifices still need to be changed.

Weedmeister, You are correct about the different sizes of the LP and NG orifices. I think the NG is bigger then the LP. Wolf built my range top for LP at the factory.

did you see any tag that has a référence on the BHU/hr rating anywhere

My range top is 5 years old and has semi-open burners. All the burners have the same BTU ratings. There was not any tags on it giving what that rating was.