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I do all my cooking on a flat pan, once its going in 15 minutes or so I keep it at a rolling boil feeding it with a trickle from my preheat tank. My pan has 6 inch sides on it and I usually keep 4" of sap in the pan. Would I evaporate more GPH if I only kept 2" of sap in it or doesn't it really matter as long as you maintain the boil?

Thanks, Trapper