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Gotcha! I really don't think you would like running 180 through there. The linear expansion and noise is enough to drive a guy batty. Pex-Al-Pex will help considerably with that, but it'll still be noticeable if you're trying to keep them straight and/or sandwiched. How long are these walls? The BTU output is pretty minimal and takes a whole lot of tubing. I took a course with Uponor this summer and was trained in their Quik-Trak system, and must say I was very surprised with how little the output really is. And sheetrock cannot withstand anything over 130* water without warping and cracking, so that limits a lot of output also. As for knocking your temp down, if you'd be adding a pump for this loop anyway, why not just pipe a mixing valve in between the primary and circulator? Then you have whatever temp water you need