What are the different types of maple sugar evaporators used in the production of maple syrup?

There are mainly two types of maple sugar evaporators used in the production of maple syrup: the traditional wood-fired evaporator and the more modern oil or gas-fired evaporator. The traditional wood-fired evaporator uses wood as a fuel source to heat the sap, while the oil or gas-fired evaporator uses oil or gas for the same purpose. Both types are used to evaporate water from the sap to concentrate the sugar content and create maple syrup.