Best Of

I prefer the Forecast sales beveled washer & bibb screw kits. In the mid 1980s, when I started, there were still tons of old style faucets & shower bodies. It was fun to rebuild stems & I have a full tool box with 6 different seat tools, et cetera. Mad Dog

Same here. I also like to us the red washers over the black when available. They seem to last longer and don't leave a black stain on anything including my hands that never seems to wash off.

Great to hear the voice of my Dutch Uncle Dan! Mad Dog

Correct, the tank connection establishes the PONPC. So any distance between that point and the circ inlet has a small amount of pressure drop. How much? It depends on pipe size, flow rates, type of fluid.

I suppose you could put some numbers to that small pressure drop, if you had all the data. I would suggest as close as possible. A few to 5' would not be a deal breaker.

One goal is to have all the circ ∆P pressure differential added to the circuit.

An example of the small "droop" here.

What you want to avoid is pulling a sub-atmospheric condition, negative pressure in the circuit. Under that condition, air could be pulled into an auto air vent, for example.

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The circulator pumps want some positive pressure at the inlet. Grundfos shows anywhere from 1.3- 4 psi at 140- 190° water temperature. The hotter the water the more prone to cavitation without adequate NPSHr net positive suction head required