Sugaring 2013 – Evaporation Rates

I have found myself with a curious quandary regarding evaporation rates.  One that could easily be solved if I took the time to carefully measure and record the amount of sap I boil off in a set period of time.  While it sounds straightforward enough, my current liquid measuring tools are a 5 gallon bucket, that is not graduated, and a watch that I am seldom wearing when boiling…

Basically I have observed two different amounts of steam being generated by my new WF Mason 2×3 Hobby Sized Evaporator.

The first scenario has the ash door open and I am experiencing a rapid boil in the pan, but limited visible steam off the top off the pan.  As seen in the video below.

Little Creek Maple Farm March 3, 2013

The second scenario involves a much more substantial amount of steam when I open the fire box door to load more wood.  As seen in the next video below.

Little Creek Maple Farm March 3, 2013

The puzzle, which scenario would you expect to have a greater evaporation rate???

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