Originally Posted by tator2k
So I guess that leads to my next question: Do you need a RIMS tube if using a larger cooler like that.
Thousands of homebrewers mash with a cooler every month and their beer turns out fine, but I bet that some are off target and the homebrewer never understands why. The cause could be mash temperature.
So, if you are as anal as I am about temperature or if you want to do a step mash with precise temperatures then yes, you need one.