my brother never put in the instrumentation for that, but I would. He had his 3 loops fused to a 1" header pipe, but I think I will bring the (4 ) loops into the crawlspace like you did. I really like the idea of independent purging and testing. My crawlspace will be just short of an unfinished basement with 6' height. That will make for a great equipment space and heat mass storage area for the solar air system.
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