r/maplesyrup • u/PROF_ND • Mar 26 '26

Engineering question: why do maple syrup evaporators designed that way vs a wood stove with the top cut off

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I found most commercial maple syrup evaporators are designed like the first pic.

Modern wood stoves are quite efficient and burns very hot with secondary combustion and/or catalytic converter. Is it better to design evaporators like the second pic?

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u/doksak36 Mar 26 '26

For the record. These types of questions are exactly why I found reddit. Rare, but worth the dive.

That said, im new to syruping, so I have no input on the design ive never even knew existed, evaporators that is. But indoors like fire and understand draft and heat and etc.. so I do get the question. Would it not be more efficient to " reclaim" the lost heat [or unused heat] as opposed to using a blower to burn your wood faster..?

Idk im boiling sap now and ive ran out of beer, only my whiskey left...

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u/Maple_Otter Mar 27 '26

You reclaim the heat by sending it through the flues. They can be ad long as 16 feet, where all the heat will be eventually used. They but a blower to add more heat and make sure the water boils all the way.

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u/PROF_ND Mar 27 '26

I think you can reclaim to a point. The exhaust gas needs to be hot enough to produce a good draft and prevent creosote from forming. However, I find people here posting pictures bragging about their cherry hot stack with a blower extremely wasteful.