What if I use the Thermosiphon Closed Loop Heat Exchanger?
This is an excellent total freeze protection option! For best operation the heat exchanger requires a tank that has a side pressure relief valve port near the top of the tank. This allows the water in the bottom of the tank to “thermosiphon” from the bottom of the tank, (the principle that heat rises) through the heat exchanger, and back into the top of the storage tank through its side pressure relief valve port. Two alternatives to this, where the tank only has a top pressure relief port, is to raise the tank 18″ on a platform and drop the bottom of the heat exchanger to the floor or have the heat exchanger go into the top element port. This unit may require minor soldering for installation. Food grade, propylene glycol antifreeze is supplied with this heat exchanger.
