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My indirect water heater circuit is making more noise than ever. The (UP 15-42 FR) circulator is currently mounted horizontally, 3/4" flange in and 1 " out. I want to change the circulator position to vertical hoping the noise will go away.
The noise I believe is directly related to water flow. Shutting the ball valve abruptly and immediately opening it once or twice causes the noise to go away compleatly for a minute or two. Then noise returns. Could the 3/4" flange in and 1 " out be causing the noise? If so, I could order a flange kit to make both in and out the same and try that before going through the trouble of remounting the circ to vertical. Thanks for your help.