Piggy back evaporator for maple syrup evaporator apparatus or the like

Abstract From the Canadian patent

A piggy back evaporator is sealably coupled in open box form overlying a standard sugar maple sap evaporator aligned with an upright box-type standard flue pan which, when fired, boils off vaporizable constituents of the sap. The piggy back evaporator includes a drip pan sealably mounted to the standard flue pan. The drip pan includes an oblique condensate drain sheet extending over the major length of the same. A steam hole within the condensate drain sheet allows steam to reach the lower surface of a bottom wall of a piggy back pan. The piggy back pan bottom wall is corrugated to define a series of laterally spaced troughs. Maple sap is fed into the piggy back pan to a level covering the …