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So I finally got around to replacing the tank last night. I shut off the boiler (power + gas) and close the water valves to and from the boiler. When I removed the expansion tank - it was completely filled with water... And when draining it, there was a significant amount of black particulate...

Hi All, My first post here! I have a Navien tankless boiler and have noticed a small leak originating from the Pressure Release Valve. When I tap on the expansion tank it sounds fairly full. With the exception of tasks that require a certified professional (such as gas installation), I like...