Wow, you can only use a stainless steel exchanger. These code bodies are mindless, and legislators are mindless for continuing to adopt their measures. Who decided citizens should be legally forced to only build something if it will last forever? That is foolish in so many ways.
I can't comment on your pending decision; I just wanted to add some code references for any readers in the US who may be worried about heat exchanger requirements. I have a few versions of code available to me.
The 2006 International Plumbing Code:
Quote:
608.16.3 Heat exchangers
Heat exchangers utilizing an essentially toxic transfer fluid shall be separated from the potable water by double-wall construction. An air gap open to the atmosphere shall be provided between the two walls. Heat exchangers utilizing an essentially nontoxic transfer fluid shall be permitted to be of single-wall construction.
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This language is identical to P2902.5.2 of the 2009 International Residential Code.