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Point of no pressure change - help me understand
I'm just a homeowner, so I have no reason for needing to know this other than my own curiosity. I've read all sorts of explanations about why the expansion tank is the PONPC, but I can't wrap my head around it.
In a closed-loop system WITHOUT an expansion tank, the circulator has no problem creating a pressure differential and moving the water, right. So what is it about having an expansion tank attached to the pipe that creates the PONPC? Does the tank somehow "absorb" the pressure of the water coming into it?
If there is somebody out their both knowledgeable and patient enough to answer this question, I would appreciate it. If not, I guess I will just take it on faith . . . kind of like gravity.