Sorry for the long subject line but, I thought it may aid in archive searches... Is there a home remedy to creating a double wall heat exchange? I have contemplated buying two sizes of copper tubing, inserting the smaller inside the larger and bending the two simultaneously. I could see how the inner tubing might kink or flatten out but, I think that would be unlikely unless I tried to bend too tight of a radius. Is there a better home-builder solution? Perhaps there is an affordable storage tank commercially available that makes building a backyard heat exchange mute anyway.? I'm going to need to come up with a storage tank anyway. I understand the theoretical pros/cons to internal and external heat exchanges but, what are the real-world practical differences?
Thanks a bunch,
Take care,
Ken
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