Seems to me, that weather you use a 220k burner, or a 55k burner, you would use near the same amount of fuel. You will only be running he flame flat out till you hit a boil. With he added BTU's, you will use more fule at that time, but reach a boil faser, allowing you to back it down sooner. With a 55k, you have to run it wide open for a longer time before the boil begins. Seems to me, it's half a dozen one way, and six the other.