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What will be the source of hot water?

Totally undecided at this point. The room with the radiant floor heat is (kind of) planned to be a shop area, but who knows how that will play out over time. My only immediate concern was to install the Pex now to allow all options later on.
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Brettski, when you going to start framing?

I'm oiling the Porter Cables as we speak text.