Anova is too big for all but a stock pot, which works nicely for many uses. I cover it with aluminum foil. For big volumes I have a big plastic tub which is I guess 5 gallons. I cover that with foil too. You could go all insulated and energy efficient, I suppose, but I didn't feel like buying a new container when I had workable stuff around. Anova is up to the heat loss from my set up...temp is rock steady.