Today was a warm day so I turned off our hot water boiler. About two hours later, I noticed a good amount of water had leaked. I assume it was from the hy-vent because it looked like it had dripped down the expansion tank, onto the boiler and down to the floor. The vent wasn't wet at this point. Both the vent and the expansion tank were replaced about two years ago. The expansion tank still is cool on the bottom and sounds empty when tapped.

I have several questions:

  1. Would there be a reason the vent would suddenly leak when the boiler was shutoff? I tried to replicate the issue but had no luck.

  2. The vent valve should be a 1/4 turn open, correct?

  3. I noticed that when the system is running, the pressure of the boiler gets to 30psi. I thought I had read that for my Peerless boiler, the pressure should be at 25. Would this cause an issue?

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