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I took a look at your project page, and the tank that you are calling a "pressure" tank looks very much like my tank except mine is 80 gal. Mine is not a "pressure" tank, it's a secondary tank with a built in coil that runs from a boiler. You ought to inspect yours a little closer to see if you might have that coil already built in to your tank. It would be more efficient than wrapping that copper around the tank to transfer the heat.
Looks like it's working well! Are you still using water in your heating loop, or have you switched to the glycol yet?
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