"Rick Blaine" wrote in message
...

It's a fact that LP is almost double the BTU content of NG per cubic foot.
Reducing the orifice size for an LP fueled burner would bring the burner
down to
the same heat output. Why would a manufacturer bring it even lower?

I don't have a clue, but most gas ranges for propane are rated lower than NG
by about 1000 Btu per burner. There may be other factors at work, such as
getting the proper gas - air mix in the burner or restrictions of the
venturi. In the case of grills, the primary fuel source is propane while in
ranges, the primary source is NG and in both cases thee is a conversion kit
that uses much of the same mechanical components.