When you run that new gas 3 burner it's very unlikely you will be able to burn it at full rate. Those burners will not evenly distribute the heat, you will have hotter and cooler spots. Even a tube burner (which distributes the heat much better) like what is used under a larger finisher with a 2x5 pan on it is not burned that hard.
To compare your BTU's to wood, on my 3x8, with firing every 8 minutes at about 18-20# per fueling (well seasoned wood) I'm adding 18x7,100 BTU or over 950,000 BTU/hr roughly, but it is well distributed under the syrup pan and about the first 2' of the flue pan (it still boils hard all the way to the back) and my pans are 20 ga., I get no warp, I just need to keep the 3/4" in the syrup pan and at least 1/4" on the flues. Some pans are 22 ga. and that works well too.
Dave Klish, I recently bought a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.
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