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I agree 12PSI should be plenty to get me up to the fourth floor. The plumber at the home center told me I'm looking for 12-16PSI. I agree the gauge is old and likely not accurate. But I'll assume this is enough pressure to start the system, and I'll listen closely for gurgles and burbs...

How concerned should I be about letting cold water into the heated system? I assume opening the manual feed valve while the heat is on will cause death and dismemberment. I was thinking this might be a good approach: Can't I use the heat to fill the pressure, then bleed the hot vapor, then...

Ok so here's the story... We are remodeling a room and needed to remove a radiator. The system has a cold water inlet (with manual override), an AMTROL FILL-TROL expansion tank (1) in basement near "American Air Purger" (2) and float type air vent (3). It feeds a...