i dont even use hot water anymore. soggy rats just dont do it for me and i dont think all of my snakes would take them. the water causes stuff to cool too quickly.
i toss all the rats im feeding that time in an empty bin in my rack, with the larger ones over the heat tape. i come back in 4-6 hours and everything is all defrosted and nice. I hit them with a hair dryer on low for about a minute and everything is ready to go. the hair dryer also helps present so even some of my pickier eaters have gotten crazy in their feeding responses.
i think i got my hair dryer for 10 bucks at big lots.