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Follow up to my first response. I see that my "direct to you" response did not post publicly, so I can be more direct: I can't address your comment publicly since I don't know whether the contractor views/reads this site. I recently discovered that I have a new problem resulting from the contractor's recent work. To wit: the contractor's work was immaculate, however, he did not conform to spec on the near-boiler close nipple dimension and on the tie-in height relative to boiler water level. Unbelievable rookie mistakes. I now am experiencing hammer at shut down. After eliminating all possible causes using Dan H's books, the cause has to be the non-spec near-boiler piping. Have yet to address w/ contractor (who fought me tooth and nail on the other stuff in spite of the fact that his as-installed was irrefutably wrong; has caused long system damage, etc). Just wanted to let you know since you asked. Will update publicly when able. Regards, KevinK