Buying a double burner grill pan requires a lot more thought than buying up a single burner pan. I didn’t do much thinking when I bought my double burner pan and the end result was frustration and wasted money.
I bought my double burner grill on impulse at an old hardware store while I was actually looking for a shovel. It was a large cast iron beauty with the reversible griddle. I have a pretty big five burner stovetop and figured I needed a pretty big stovetop grill.

Technically this is a 24 inch double burner grill as the grilling surface is 24 inches long. Actually this is a 28 inch grill because you have to take the two inch handle on either side into consideration. Why does this matter? Because of the danged handles this grill is too large to fit across a front/back burner combination on my stove (the backslash gets in the way) and is too small to reach across my two front burners.
My Double Burner Cast Iron Grill
Technically it does reach across the front burners but the burners are right at the edges of the grill which means I would have a significant cold spot in the middle of the grill.
The moral of the story is to make sure you measure your stovetop and understand all of the dimensions of a double burner grill before you purchase one. If anyone is willing to pay the shipping I’ll be happy to give you mine!