Hot water radiator boiler with extol tank under air scoop under brass pressure release valve. Last couple days, heat running 0 psi and 160 temp with water gurgling from release valve cap. when over gallon in bucket, I lifted the fill lever on the "bell" and it filled with water stopping on own at some point around 12-15 psi. I turned on heat - it ran up to 20 psi and nearly 220 temp, so I turned it off. Brass release valve spewing water. Plumber thought it was tank until I said temp went high- so now thinks something else bit what. He come slater to look , but seems still should be some concern about tank. Thoughts?
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