here indeed is a story, second hand information. i have a friend who uses a cheap crock pot type 30L electric kettle thing. i have never witnessed this in person, but apparently he mashes in there using the temp knob but checking with an actual thermometer, does step mashes, then dumps the grain to a colander and sets a grain bed by recirculating (by hand, ie pouring back over with a pitcher or something), then heats sparge water in the kettle and sparges, collecting wort in the fermenter, then siphons back and boils the wort in the same crock pot. he said his brew day takes an absurd number of hours, but apparently he likes the ritual of it all. personally, if i were to use one of those pots, i would BIAB like earwig suggests, either not sparging or heating the sparge water on the stove in a smaller pot and just dunking the bag in there. much much easier.