The sap is collected into a large holding tank and from there is fed into the sugar house (the place where the magic happens!). In the sugar house, it is systematically poured into an evaporator (pictured here). Maple sugar evaporators are specially designed to ‘boil off’ hundreds of gallons of water very quickly and so the sap is concentrated into maple syrup. This is called ‘boiling down’.
The evaporator works by first ‘pre-heating’ the sap so that it is almost boiling. This is done by making use of the steam that is already coming off of the evaporator. A series of pipes works the cold sap through the hot steam under the hood at the rear of the evaporator. The rear portion of the evaporator is where most of the serious boiling takes place. There are groves in the pan that drop down into the heat source below (fire, oil or otherwise). These give the pan more surface area and so the boiling is more fierce.
As the water is boiled off and the sugar becomes more concentrated, the sap moves toward the front of the pan. There, the sap becomes syrup and is ‘drawn off’ into a pail or some other container before it is filtered. The syrup at this point contains nitre or sugar sand. This needs to be removed from the syrup or it will have an off taste.
Once filtered, the syrup is put in bottles or containers and sealed until someone opens it up to enjoy a sweet treat!