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Speedy Jim

wrote:
My water heater in my rental apt is making a very faint
whistling noise?

Advice on what it is?

Try to narrow the source down. Put ear by burner
opening. Could be normal sound of gas in pilot.

Could be a very small water leak too. If the leak is
in the central flue of the tank, you won't see any
water as it will be carried up the flue. But a leak
in the tank can mean impending failure.

Jim