A healthy, properly functioning water heater should make very little audible noise during its normal daily operation. When heating cycles run, you might hear a faint, soft hissing sound from gas burners, a low murmuring hum, or quiet clicking from electrical control relays. These gentle sounds are entirely normal and expected. If your water heater begins producing loud rumbling, violent popping, cracking, or hammering noises, it is no longer operating normally and requires immediate sediment flushing or professional inspection. Verification: Monitor your water heater's baseline noise level during regular heating cycles.
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