I've posted parts of this before:
below are the grills that I own ( Genesis 1000, Silver B, E330 ) or often cook on ( E320, E310 )
BTU rating is from the tag on each grill.
Grate square inches is from literature on sales sites and is only the main cooking grate.
| 1998 1000 (side) | 2000 Silver B (side) | 2009 E320 (side) | 2016 E310 (front) | 2016 E330 (front) |
| square inch | 424 | 424 | 507 | 507 | 507 |
| BTU | 35000 | 36000 | 42000 | 38000 | 48000 |
| BTU/sqInch | 82.5 | 84.9 | 82.8 | 75.0 | 94.7 |
For the E330, the 94.7 number is misleading because it spreads 10K BTU from the sear burner across all square inches.
In terms of direct heat under the grate, the right side grate is 75.0 BTU/SqIn and the left side is 114 BTU/SqIn
Front control E310 has
12% less BTU per square inch compared to a Silver B
10% less BTU per square inch compared to a Genesis x000 or an E300 series side control.
Overall front control E330 has
11% more BTU per square inch compared to a Silver B
13% more BTU per square inch compared to a Genesis x000 or an E300 series side control. ( overall )
Obviously with the sear burner more heat is on the side with the sear. On the E330 sear is 10K BTU.
2017 and newer have higher BTU sear burners, but I don't recall the details.