Just so you know, I'm pretty sure building code requires any heat exchanger that has antifreeze in it that connects to potable water to have a double wall with the space open to allow drainage should one part of the heat exchanger leak it will not contaminate the potable water... it's screwy.
one way that some heat exchangers are done is the cold water is in your center pipe then some soft copper tubing is wrapped around the outside and soldered on to keep it in place.
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