I've had good success making bourbon barrel aged maple syrup. I heat the syrup to 190-200, then pump it into a recently emptied barrel and then when full I seat the bung. I seem to do it a little differently than many others. I spray the barrel with a mist of clean water 2-3x a day for 7-10 days, then I cut back to 1x a day for 10-14 days, then every other day for about a week and then 2x a week until the aging is done. As I spray it I turn the barrel. I do this by setting it on a frame much like a moving dolly but the wheels are all rigid. I do that to keep the barrel staves swelled to keep any leakage to a minimum.
I age a 5 gal bbl 3-3.5 mos, a 10 gal 6-7 mos, and a 15 gal 9-10 mos.. About 2 weeks before the times stated I open the bung and get a small sample. It has never been ready on that first test. I then get a new sample every 7-10 days until the taste is a perfect balance between maple and bourbon flavor.
Once I decide it's ready I pump it into my finisher and heat it to about 190F. Then I shut if off, place the cover on the finisher and let it set overnight. The next day I heat it to about 175-190, send it thru the filter press and into my water jacketed bottler. There I heat it to 185-187F and let it set overnight leaving it at that temperature. The next day I bottle it. I've tried a few different bottles but the flask shape seems to be what everyone wants. I pack in 2 different sizes of flask shaped bottles.
I had labels made, which state "less than 2% alcohol". I never had it tested, but my thinking is that the 2 heats would have boiled off any alcohol that might have been in it as pumped from the oak barrel.
The method I've used gets a very high return customer rate to buy more. I have had a few customers who said they had tried others but they usually said the liked mine better, they never said they liked the other one better.
Ever since my first batch my bourbon barrel aged syrup has been a major component of my yearly sales. In 2017 I packed my first 2 batches, and dollar wise it was about 1/3 of my years sales even though the first barrel was bottled in late August. In 2018, and 2019 it accounted for 49-52% of my years sales. In 2020 it fell back to 41% but that was because my regular syrup sales shot up significantly. So far in 2021 I haven't yet calculated it, but it looks to be about 50% of my dollar sales. I won't determine the final until January 2022.
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.