Experienced sugarin' expert Rink Mann explains step by step how to make maple syrup in your backyard.
Excerpt from Homemade Evaporators page 31
Building a Homemade Backyard Evaporator Making your own backyard evaporator is a process of sizing up what materials you have lying around your place, what you can scrounge up elsewhere, and putting together something that will get a lot of hot flames against the bottom of your evaporator pan or pans with a reasonably efficient use of firewood and with some degree of fire control.
If you're related to a building supply dealer, maybe you can get him to give you some "irregular" cement blocks to build your evaporator out of, or a local plumber might have some discarded water pressure tanks out behind his shop. With an emery blade on your electric saw or a cutting torch, you can make a very professional acting (if not looking) evaporator. Then too, a heating contractor might have an old oil storage tank he'll let you have, which would make up into a nice fire box, and some rusty old stove pipe, which might be just the ticket for your smokestack.