The losses can effect the efficiency, I get that as you state, this effects volumes which is what I was getting at, you explained it more specifically, thanks
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You can try a light bulb in a coffee can instead, should be able to get warmerNo experience repitching 3724 but I can tell you if you pitch it warm, like above 75 and simply allow it to self rise into the 80-90 degree range it will ferment quickly, without stall and easily below 1.010 and produce a great beer!
+1 to this. Also, make sure it doesn't drop in temperature too quickly after high krausen. If your house is cool, a heating pad may help.
For this last batch, I pitched at 67F and increased temperature by 1F per day until I got to 76F, then held at 76F for another 10-12 days.
I use bucket fermentors in a dorm-room fridge w/ a 2-stage controller. For heating, I use a heat belt - one of those thick plastic ones, not the cheap thin strip. Temp probe in thermowell through airlock hole. Bucket lid was loose to relieve pressure and simulate open fermentation.
I found that the heat of fermentation would not increase the fermentor temperature - to step up the temp, I would have to increase the heating belt set point.
Anyone else have this issue? I'll continue to post updates - using the harvested slurry in a rebrew this week.
BVIP is always a good go to for me in the winter.