I'd appreciate any advice, as I know nothing about this. Had a new Burham oil burner installed 3+ yrs ago. All was warm and quiet until this past December, much loud noise when circulator would kick on. I have a contact with reputable oil co. who came over and bled the line. Problem resolved. About a month later, noise (and air) problem came back to same degree. Oil co. returned and bled the line again, saying that temp. was too hot causing steam to build that relief valve couldn't handle, so lowered temp to 180 degrees. Everything is quiet for now, however, I now notice that when I turn the hot or cold tap on in the kitchen, that air shoots out first - 2x an hour apart. FYI, I have a single zone, closed system. Are these 2 issues related or just coincidence that happening at same time? Thanks