I have a Weil-McLain WGO-4 boiler. I am using the T&P Relief Valve that came with the kit; 30 psi, 375,000 BTU. I get about a quart of water out of the T&P every week. I'm wondering if the T&P is marginal or do I have too much pressure in the boiler. I opened the T&P a few days ago for a few seconds to see if it just needed to reseat, and it ran without stopping, putting out about 4 or 5 gallons of water before the flow reduced. Even so, it put out about an additional gallon before it settled back into it's usual output of a quart a week.
Here is a photo of the T&P gauge on the boiler:
As you can see, I'm running about 185 degrees and 33 psi at the gauge (photo was taken about 2 minutes after the boiler stopped running). Should I simply lower the temperature? The behavior of my T&P relief valve test makes me think the valve itself could be the issue.