There was a thread about this a month or two ago and also an article in Trailer Life Mag. As long as you have no leaks and it is only when gas is actually being used then it is mostly a "resonant harmonic" in the regulator according to the expert in the article as stated above. He also said as noted above that you can try to replace the regulator and pigtails but it is not a guaranteed fix. We also have the problem but just turn the water heater off at night. In the winter we run a small fan in the bedroom and it drowns out the sound at night when the furnace runs, Best wishes, Jay and Kathy
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