I've never heard a hum from my water heater. I use electric 95% of the time.
I suggest you open the outside cover and see if you can zero in on the source of the noise.
Enjoy Santee! It almost always gets stellar reviews on campgroundreviews.com.
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-Scott, DW, DG, DB, and DD
2011 Passport 2590BH
2009 Ford F150 SuperCrew F X4 5.4L w/Max Tow
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