How many gph

[C&C maple sugar bush]

3 by 4 flat pan on a all fire bricked arch wit a blower going into the ash door, and a steam hood over the pan firing with 2 year old dry red pine how many gallons per hour do you think

[TerryEspo]

I'll bite and give my uneducated guess of 16-18 GPH.

Now lets see what the good guys who know better, say you should get.

Happy boiling.

Terry

[Wood burn]

Hi guys sorry this is off the topic but I'm new to this site . Can someone tell me how to start a new thread the only thing I've been able to post is my visitor message in my profile ?

[Run Forest Run!]

Hi guys sorry this is off the topic but I'm new to this site . Can someone tell me how to start a new thread the only thing I've been able to post is my visitor message in my profile ?

Wood burn, go into the section in which you would like to start a thread and look in the upper left hand corner. You'll see a button that you click to start a new thread.

[emo]

I think the theoretical rate for a flat pan is about 1 gph per square foot, so about 12gph. With a blower, I would think you would get better than that.

[maple flats]

It is considered normal to get 1 gpm/sf for naturally asperated (draft door letting air in). Adding a blower generally adds about 12-15%. Thus you have 12 sf=12GPH + 12%=13.44, maybe 13.5.

[snox243]

my first set up was a 3 by4 flat pan with blower did around 15gph

[Wood burn]

Thx Run forest run i found it now I'm able to post . I never saw it there I was always looking at the top of the page thanks again .

[bannonbush]

i wana chime in hear, i built an evaporator out of an old wood stove insulated and added small blower.. pan is 18"x40" so roughly 3.75 squre feet??? im getting 6.5-7.0GPH so according to the 1gph per sqf im actually doing pretty good?? i was hoping for more gph but maybe thats all im gona get??

[maple flats]

make the pan with flues of some sort and you increase the surface. The surface formula is the bottom of the pan, not the surface of the boiling sap. This is why flues run from made from about 4" all the way up to 11.5" tall. That gives them far more surface area to extract the heat from the fire. Mine are 10" high, on a 3x5 flue pan, giving me about 92 sf of bottom in a 15 sf area.

[mantispid]

Odd question...

Does adding inert material with irregular surfaces improve GPH? That is to say, boiling stones, etc.?

[Rugburn]

I'd say around 12-14. I have an old Grimm 2x6.5 flat pan. Last year it ran about 16 gal/hr. For this year I made a few changes and it's getting 22 gal/hr, natural draft. I choked the back with some 1/2 bricks and used pine instead of pallets. She really cranks for me now.

[mike z]

I have a 2x8.5 flat pan setup. If I'm real attentive and feed it every 5 min. all the dry wood it wants, I can get 25 g/hr. But I'm usually not that attentive, and a little stingy with the wood, so most of the time get around 22 g/hr. No blower, no preheat.