"Kent" wrote in message
Edwin, isn't it BTU/surface area? When a large grill has 36K BTU doesn't
it
heat to a lower temp. than a small grill with the same BTU? That's always
been my assumption.

Kent

Yes, surface area make equal comparisons more difficult. Some heat more
evenly than others but a smaller area can be hotter than the same amount of
Btu spread out.