A vibrating or humming noise coming from your hot water tank is typically caused by water hammer vibrations, loose pipe mounting straps, or electrical transformer hum from control relays. When water flows through pipes or valves close rapidly, hydraulic vibrations can resonate through the tank shell. Additionally, loose copper or PEX pipes vibrating against wooden framing studs during heating cycles can create a distinct buzzing or shaking sensation. Verification: Secure loose supply pipes with cushioned pipe straps and check water pressure.
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