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Radiant Heat System - Inconsistent Pressure
I have a radiant heat system that fluctuates in pressure between 0 and 40 and can't figure out why. To give some background:
System is 10 years old. Original tank was replaced in 2016.
A leak was discovered in the system in February after some flooring work was done. Source of leak was determined in March and fixed by heating company. Lines were flushed at the time.
ST-5 tank, pressure gauge and valves were all replaced in February.
Interior manifold, located in the upstairs master bedroom closet, was reconfigured in February.
System maintained pressure for a couple of months after leak repair and then started to fluctuate in spring. Heating company came out, flushed the system again, but could not determine source of problem. Pressure remained stable throughout summer.
Pressure started to fluctuate again starting last week as colder temperatures in the area kicked in.
I've checked the indicator at the bottom of the ST-5 tank and it appears to be functioning normally (I also tapped it and seemed fine). I've attached some pictures of the system for reference. Any ideas on what else I should check for?
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