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After randomly searching online I found a couple videos that had the exact same issue. It does have to do something with the gas line and it might involve a defective burner possibly. Going to see if I adjust the gas valve and see what happens. If it doesn’t work then I will contact the...

No the noise starts when the water heater kicks in. I checked the psi and it stays somewhat consistent when I turn on the faucet and when that noise happens.

So the noise occurs when hot water is used and probably starts after a few minutes when leaving the faucet on. So there is water flowing. This is the only time that I hear it. It does not make this noise while the water heater turns on to maintain the temp.

David, I was going to buy a water pressure gauge to test the psi. The noise is definitely coming from the water heater area and not the toilet. Diehard, can you go more in depth how gas flow be the cause for this issue? This is a gas water heater. The noise does start when the gas comes on...

I recently replaced a water heater. The original had no thermal expansion tank and no noise previously. Once the new tank was installed, every time the hot water is used and the water heater turns on the fog horn noise happens. It lasts for about 5-10 seconds and the noise slowly dies down...