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Yes, please post back. Is your aqua therm running under pressure? I know some guys do and some don't. Either way letting it burn down and using a wire brush a bit would tell a lot. Hope it's some condensation!
Dec 25, my boiler had been shutdown for a day due to travel (to Campton NH!) I came back to a pinhole leak on the inside of the firebox, at the door ring, on the weld positioned about 7 o’clock. I had a small fountain. My S-275 is about 17 years old. Drained it wire brushed it and I have used the JB weld on it. I am waiting to replace the pressure relief valve before I send water back out there. Have the valve but need the help of a plumber to remove the old one. Also waiting until it warms up a little, we are in frigid conditions where the daily highs have been single numbers. I’m afraid the water will freeze when it hits the exposed pipes and boiler. I am very interested in what success you’ve had in fixing your leak.
6011? Really? Wouldn’t be my first choice, however I have access to a pretty heavy wire welder with generator. If I had to stick it think I’d try 7018.