Ok did some tests and got some numbers.
Did 9 1/2 gallons of water with the burners near the same distance.
The weed burner was 1/3 of the way on. While the turkey fryer was
Harbor Freight Weed Burner
86F -> 116 in 5 minsTurkey Fryer
(what I've been using)
90 -> 110 in 5 mins
With these numbers the weed burner can bring the HLT from 85 to
212 in 22 mins. Where the turkey fryer would take 33 mins.