First,,,, the crock pot is not going full bore the 3 weeks time. It warms up to 100°F and turns off for a period.I'm just worried about how a crock pot is not going to overheat and shut off in 3 weeks
During winter I use 4 mini Crock pots in my winter housing for chickens. They are connected to a dimmer switch circuit. I keep the water at (about finger temperature , guessing 60° to 70°F ).. so it does not freeze. December to March each year. Have not burned out any crock pots yet.
I use these mini ones. I like the way the inserts come out for ez cleaning.
