Last season I had an 18"X22" pan cut into a barrel stove with a banquet pan across it for a pre-heater. I dipped sap from storage drums with a quart sauce pan. So, I was measuring a gallon and a half into the pre-heater about 3 times a hour. So with about 400 square inches I was getting around 4 GPH. I think?? The new setup will be 1440 sq. inches and maybe a flue pan.

I did get the top torched off of Old Rusty and trimmed the legs down to 6 inches, it was on 4 foot tall pipes. If I put the worst end to the back and brick the rest.
I need to get some sheet steel and angle iron and see how it goes. I'm planning to build a box across the back so the flue pipe won't take any space from the sap pans and then come up with some sort of blower.

I'm thinking that if I make a decent arch and buy a good set of pans I maybe set for a few years. Sorry that we have so long to wait for next season.