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I’m designing a solar hot water system for the new house. Among other things, I’d like to introduce some hot water heating into the ceiling of the basement. (Doing the floor is out of the question because of height, however I can run lines in the joist spaces before covering the ceiling.)

So, to make the description easier, imagine a ladder, except instead of aluminum side rails and steps, it’s all pipes, PEX, probably. The left side rail has an input at the bottom and is capped at the top. The right side rail is capped at the bottom and has an output at the top. The water can flow in the left side rail, through any of the “rungs”, and out the right side rail.

Would you expect the water to flow fairly evening among all the rungs, or would it tend to go through the first rung and hardly any through the last rung. (Remember that this is a ceiling, so the “ladder” would be hung horizontally making all the rungs at exactly the same height.)

I would hope for relatively even distribution, but I fear that the first rungs the water gets to will get most of the flow, and the last ones hardly any - but I’m asking for opinions. Thanks.
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