You know something? I used a Rival full size crock pot for a long time, holds the temp perfectly well. Santa brought me a Hold Heet. I like having the extra water in the crock to dip my veneer hammer plus cleaning glue off things like tooth brush etc..
It works great, I don't put the glue directly in but use a jar. Hold Heet doesn't have that much room. Forced me to install a hot water heater. Don't think I'm any further ahead, someways I went backward.
So IMO if you don't have a sink and hot water, I'd go with a crock pot.