I have an old 4 gallon, aluminum, percolater. Could it be used to make an all-grain beer? I have only seen one article with the concern or the temps being too high. The basket seems to be large enough for almost 3 quarts of grain.
from my understanding perc's boil water which forces it up the spout into the bed of grounds. In that case you would certainly get astringent flavors leeching from the grians since it would be over 170F. I could be wrong but i doubt it would lead to good tasting beer...
I use my coffee urn as a hot liquor tun.
It heats 4 gal at about 2F per minute.
But the temperatures are all wrong for brewing beer.
A Taylor thermometer with an alarm tells me when it is at the strike temp.