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Devil's advocate here: It seems that you're heating either way; whether you heat to mash-out or heat the sparge water you're still heating the entire grain bed which ends up being 'wasted' heat because much of that heat remains in the grain bed. When just heating the kettle up to the boil you're not devoting all that 'thrown away' heat to the grain bed.I mash-out and sparge hot, just making the point.