I'm new to all grain myself. I've been using two separate kettles and a bucket to do my batches. Bring my mash water to temp in one, water heating in the second (with ball valve to drain into a pitcher for sparging on the fly) and collect in the brew bucket. Although I only have a five gallon kettle, which means I have to boil in two batches. But so far it's working well. My efficiency is not what I'd like however.