Last fall we boiled water and averaged around 160 GPH the typical short term speed is between 150 and 170 GPH. With 12% concentrate we average 20 to 25 GPH of syrup. So we consume 12% sap at around 190GPH. We burn mostly hardwood but some pine and hemlock...not much slab wood. These evaporation rates are roughly the same as our old 4X12 inferno with a preheater.













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