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heat containment, use are concerned
Are you trying to figure out how to heat it? We have a stainless steel wood fired syrup cooker that holds 60 gallons of sap. We continue to add more sap as the moisture is cooked off of it. Once it reaches a color stage (starts to have color) we then transfer that to a propane burner to finish it off.
Use a good thermometer and a hydrometer to tell when your moisture/sugar ratio is correct. Be sure to use a syrup hydrometer and not a sap hydrometer. The hydrometer measures the sugar content of your finished produce. If the syrup is done the hydrometer should float so that the top Hot Test red line is even with the surface of the liquid.
Once the syrup is done you bottle it.