Gas Boiler losing water pressure

What makes you think it's losing water pressure?

Is it wet under the boiler?

What's the chimney look>

Is the relief valve piped into a floor drain? It could be overheating and relieving into the floor drain without you knowing it....that's why having piped that way is against code...but I see it done all the time.

Do you not have a water feeder valve that automatically feeds water into the system? A what pressure do you see? operating pressure is what? then it drops to what? Share what it is you see LOL

-Canadian Heat

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Go up on the roof and watch the chimney on a cold, icy snow covered roof day. Look for water vapor out the chimney. It usually takes about