What is the ‘point of no pressure change,’ and why should you care?

What is the ‘point of no pressure change,’ and why should you care?

I propose that we call it the “point of no mechanically induced pressure change,” or PONMIPC. Essentially, the PONMIPC is that place in the system to which the expansion tank is connected. Regardless of the pump’s location in relationship to this point, it cannot cause any mechanically induced pressure changes at this point. 

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In all the years that I have been writing and teaching, I have found that one of the hardest concepts for people in the hydronics

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