Can I change the air relief valve on one of my hydronic heating registers without draining the system,I have a water shutoff valve at the register and the system is cold.The boiler pressure shows 10 lbs. Thank you, Mike.


If it is a hot water system then what you are calling an "air relief valve" is actually a vent valve and "NO" the radiator has 2 connections and you would have to shut off both connections not just one.

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