Hello, i use the submersible pump and aquarium chiller only during the fermentation and the crash cold stages, as you can see the bottom tank (unitank) has a jacket for water, it is empty while mashing and boiling, after boiling i use it to pass water slowly to cool the wort down from boil to pitch temperature, the water entering is room temperature and is hot at exit then goes to drain.
After pitching the yeast i move the unitank to a small room where i have 2 hoses coming from outside the room through the wall, this hoses are from the aquarium chiller which is placed outside the room so the heat exchanger can be more efficient, then i just installed a small submersible pump on the floor inside the room, then connect the 2 hoses to the unitank´s jacket and set the fermentation temperature on the chiller and that is all.
About being dangerous, it is not, i have placed base to receive and clamp the 1-1/2" tube leg on the floor to hold one of the 3 legs, but after many cookings i realized it does not need it since the tank is very stable.
