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Sap preheaters: efficient maple syrup processing

The use of sap preheaters to transfer heat energy from stack gasses or steam above the evaporator pan to incoming sap is not new to maple producers. They have experimented with these techniques in the past. In general placing coils or tubes in the stack usually leads to either scorched sap or extreme surging, air locks, or even entrapped steam in the tube bundles. Tubes placed above the evaporator pans have been tried, also, but syrup producers either failed to enclose the tubes in a hood or permitted condensate from the tube bundle to fall back into the evaporating pan. As a result, the maple industry has not adopted heat exchangers or sap preheater technology to any great degree.