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Fly Sparging: Can I start boiling straight away

I fly sparge directly into my boil kettle and in general I have the heat on while I'm doing this. When this was on my stove it wasn't powerful enough to get the water boiling before finishing the sparge so it saved me a bit of time. Now I have an outdoor burner that is very powerful.

I'm wondering is it ok to start it boiling while sparging or should I wait till sparging is done? Specifically, why should I do one or the other?