I've joined the legion of girly men, changing from a hand fired bituminous monster to an EFM-520 --Oh lazy days. However, I discovered tonight I have a leak around my domestic coil, and the manual isn't specific on that installation. My boiler was used, and had the "patch panel" added in the domestic area, so now, I have 1/2' studs where the new gasket, and domestic plate is installed. My leak is along one of the studs? When I removed the nut, the water sprayed out, at boiler pressure, so I hurriedly rolled an o ring down the stud, smeared some red rtv silicone on, and ran the nut down again. Seems to have stopped that leak, but should there be an o ring on every stud? should I pull the coil and try and figure out why the water came around the interior gasket? I wouldn't expect to have these studs to have made a water tight connection, so somehow the water got to the studs. Looked like a competent welding job, so I don't know where to look next. Other than that issue, I had no big problems other than the grunt work getting it installed. What to do?