Originally Posted by Adeering
it can be submerged pretty deep, i would say a little over a foot, the controller box sits on the outside of the pot so the part where the metal connects to the box at the top sits on the top of the pot.
Im using a 8 gal pot with a ball valve currently, and a propane tank to heat it.
the problem with a controller is it would cut power to the control box and when it put power back on it doesnt automatically start heating again you have to push the buttons so defeats the purpose of having it automatically control the temp
You'd need to interrupt one leg from the control box internal relay and the element itself and control that leg with your external temp controller. This could be tricky and potentially dangerous if not performed properly. Especially since that unit it UL listed, so getting in to that liquid tight control box may be extremely difficult.
Another potential problem that could arise when using this as a MT is that the manufacturer warns not to remove the immersion heater (or drain) unless the liquid temperature is below 100* F. This would suggest it's a high density element and could easily burn out if dry fired or drained too early. They also recommend avoiding exposing the control box to precipitation.