I used an old tool box, and mounted the 2 pump on/off controls, the heating element main switch, and a GFCI to make all safe. Pumps plug into the panel as well. it is all in Leviton Decora 4 gang and 2 gang setups. 2 gang for the heating element controls, and the 4 gang for the standalone GFCI and pump controls. Worked very well to used on 20amp GFCI to protect both the pumps and the RIMS 1500W heating element. I hate using the residential setup, because it lacks coolness factor, but works so well.
You will notice that the 2-gang does not have a plate, that is becasue after all was built, it turns out they, Leviton, does not make a 2 gang plate cover for a 20 amp outlet and Decora switch. I still need to modify one for my use. This is a temporary setup as I am wokring on a single tier cart and control panel.
The GFCI protection circut is the far left one in the 4-gang. Toolbox has PID controller built in as well and the tri-clamp based RIMS system is below that.

