I just got the KAB6 off the UPS truck. I'll take some pictures and start a new thread. I've got some measurements.
I have this same burner and I can bring 7gals from 140 degrees to a roiling boil in 20 minutes. It is aprox 40 degrees outside and a light breeze when I did this test. I do not feel this burner needs any modifications.
Which one the KAB4 or the KAB6?
Springer:
What's your new height from top of burner to top of supports?
They are now at 2 1/2" from the burner
Have you given it a test run yet, how did it boil with the mod?
12 gallons of water to boil in under 40 minutes from 49°. Wish the tap water would stay that cool all summer
Springer, I like that, but, alas, I don't weld. Any weldless option that you can think of?
Springer,
Have you seen a performance increase since you modified it?