The water doesn’t have to be “lukewarm” given the nature of the way the sous vide works you can fill the tub with ice and enough water for the circulator to be able to work and it will melt off the ice when you turn it on to cook. This is how you get around the leaving raw meat in warm water issue.
The water doesn’t have to be “lukewarm” given the nature of the way the sous vide works you can fill the tub with…