You would ALWAYS want to make sure to use a non-toxic anti-freeze with a single-wall heat exchanger.
I believe that most building codes specifying double-wall go back to when we only had very poisonous anti-freeze. But, building code comment is noted.
Right now, this is all just back yard experimenting.
The single tube in a tube is pretty easy to build and very efficient.
I just test fit the PVC tank adapter into the electric heater element port. It went right in very easily. The O-ring squished right up between the flat lip on the tank and the flat part of the conduit connector.
Also, I must have measured close enough, because I was able to connect BOTH ends of the heat exchanger to the tank at the same time. In the back of my mind, there was always a little bit of fear of the exchanger being just enough too long or too short for both ports to line up!
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