Tonight, I tried an experiment.
I have a 1 1/2 gal. crock pot with a porcelain bowl in it.
I placed 2 qt. Of water in it and turned it on HI, to see what max temp I could achieve. Around 135 degrees .
Porcelain has an incredible heat retention to it.
Heated water on the stove to 170 degrees, add 3 lbs of grains, stir get to 158 degrees and hold for an hour.
Got the target temp, placed a thick towel over the lid and turned the heat to low.
I helped my 9 year old daughter with her geometry.
Yes. 9 years old, she’s learning geometry.
I opened the lid, and smell that beautiful malty cereal sweetness. My daughter thinks it smells horrible. I love the smell.
I strain the grains, chill the wort.
1 1/4 gal of water ended up with almost a gallon of wort.
Hope this works.